mirror of
https://github.com/badvision/lawless-legends.git
synced 2024-12-26 04:32:05 +00:00
Made progress on garbage collection.
This commit is contained in:
Martin Haye
parent
f4e7586c13
commit
6ddc105fd8
@ -42,6 +42,18 @@ DISK_BUF_SIZE = $800
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diskBufEnd = $4C00
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headerBuf = $4C00 ; len $1400
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; Memory used only during garbage collection
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gcHash_first = $5000 ; index is srcLo ^ srcHi; result points into remaining gcHash tables.
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gcHash_srcLo = $5100
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gcHash_srcHi = $5200
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gcHash_link = $5300
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gcHash_dstLo = $5400
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gcHash_dstHi = $5500
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; Heap area
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heapStart = $F000 ; must be page aligned
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heapEnd = $F800 ; must be page aligned
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; Other equates
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prodosMemMap = $BF58
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@ -168,6 +180,49 @@ j_aux_dispatch:
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bit setLcRW+lcBank2 ; back to PLASMA
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rts
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;------------------------------------------------------------------------------
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; Print fatal error message (custom or predefined) and print the
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; call stack, then halt.
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_inlineFatal:
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pla
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tax
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pla
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tay
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inx
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bne fatalError
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iny
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fatalError: !zone
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sty pTmp+1 ; save message ptr hi...
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stx pTmp ; ...and lo
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jsr setnorm ; set up text mode and vectors
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bit setText
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jsr setvid
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jsr setkbd
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lda $24 ; check if we're already at start of screen line
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beq + ; no, no need for CR
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jsr crout ; carriage return to get to start of screen line
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+ ldy #40 ; set up to print 40 dashes
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lda #'-'
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.dash: jsr cout
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dey
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bne .dash
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.msg1: lda .prefix,y ; print out prefix message
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beq +
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jsr cout
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iny
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bne .msg1
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+ tay ; start at first byte of user message
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.msg2 lda (pTmp),y
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beq .msg3
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jsr cout
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iny
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bne .msg2
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.msg3: jsr crout
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jsr bell ; beep
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.inf: jmp .inf ; and loop forever
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.prefix:!text "FATAL ERROR: ", 0
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;------------------------------------------------------------------------------
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; Normal entry point for ProDOS MLI calls. This patches the code at $BFBB.
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enterProDOS1: !zone
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@ -266,10 +321,8 @@ __asmPlasm: !zone
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.badx ; X reg ran outside valid range. Print and abort.
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+prStr : !text $8D,"X=",0
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+prX
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ldx #<+
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ldy #>+
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jmp fatalError
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+ !text $8D, "PLASMA x-reg out of range", 0
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jsr inlineFatal
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!text $8D, "PlasmXRng", 0
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;------------------------------------------------------------------------------
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; Debug code to support macros
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@ -425,6 +478,316 @@ closeParams: !byte 1 ; param count
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closeFileRef: !byte 0 ; file ref to close
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paramsEnd = *
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;------------------------------------------------------------------------------
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; Heap management variables
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MAX_TYPES = 16
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nTypes !byte 0
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typeTblL !fill MAX_TYPES
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typeTblH !fill MAX_TYPES
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typeLen !fill MAX_TYPES ; length does not include type byte
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heapTop !word 0
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gcHash_top !byte 0
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;------------------------------------------------------------------------------
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; Heap management routines
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; Set the table for the next type in order. Starts with type 1, then 2, etc.
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; x=ptr lo, y = ptr hi. Tbl: type size, then offsets of ptrs within type, then 0.
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setTypeTbl: !zone
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tya ; save addr hi
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ldy nTypes
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cpy #MAX_TYPES
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bmi +
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+prChr 'T'
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brk
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+ sta typeTblL,y ; addr hi
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sta .ld+2
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txa ; addr lo
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sta typeTblH,y
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.ld lda $1000,x ; self-modified above: fetch length byte
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sta typeLen,y ; save that too
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inc nTypes ; bump type count
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rts
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; Clear the heap
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heapReset: !zone
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lda #<heapStart
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sta heapTop
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lda #>heapStart
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sta heapTop
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lda #0
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sta nHeapBlks
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; fall through to:
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; Zero memory heapTop.heapEnd
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heapClr: !zone
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lda #0
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ldx heapTop
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ldy heapTop+1
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.pg sty .st+2
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.st sta $1000,x ; self-modified above
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inx
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bne .st
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iny
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cpy #>heapEnd
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bne .pg
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rts
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; Allocate a block on the heap. X = $00.7F for string block, $81.FF for type $00.7F
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heapAlloc: !zone
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lda heapTop
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sta pTmp
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lda heapTop+1
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sta pTmp+1
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txa
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ldy #0
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sta (pTmp),y ; save obj type on heap
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bpl .gotlen
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and #$7F
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tay
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lda typeLen,y
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.gotlen ldy pTmp+1
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sec ; add 1 for type byte
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adc pTmp
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bcc +
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iny
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cpy #>heapEnd
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bcs .needgc
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+ sta heapTop
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sty heapTop+1
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rts
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.needgc jsr inlineFatal : !text "GcNotImpl",0
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; Input : Carry set = add if not found, clear = check only, don't add
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; Output: Y-reg = index
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; Carry clear = not found (added if requested), set = found
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gcHash_chk: !zone
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lda pSrc
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eor pSrc+1
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tax
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lda gcHash_first,x
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beq .add
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- tay
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lda gcHash_srcLo,y
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eor pSrc
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beq .found
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lda gcHash_link,y
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bne -
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.notfnd bcc .ret
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inc gcHash_top
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ldy gcHash_top
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lda pSrc
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sta gcHash_srcLo,y
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lda pSrc+1
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sta gcHash_srcHi,y
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lda #0
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sta gcHash_dstHi,y
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lda gcHash_first,x
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sta gcHash_link,y
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tya
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sta gcHash_first,x
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.ret clc
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rts
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.found sec
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rts
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; Verify the integrity of the heap
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heapCheck: !zone
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lda heapTop
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sta pTmp
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lda heapTop+1
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sta pTmp+1
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ldy #0
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.blklup lda (pTmp),y
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bmi .isobj
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; it's a string; check its characters
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pha ; save length
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beq .nxtblk ; handle zero-length string
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tax
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.stlup lda (pTmp),y
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beq heapCorrupt
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bmi heapCorrupt
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iny
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dex
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bne .stlup
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.nxtblk pla ; get length back
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sec
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adc pTmp
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sta pTmp
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bcc .blklup
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inc pTmp+1
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lda pTmp+1
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cmp #>heapEnd
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bcc .blklup
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bcs heapCorrupt
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.isobj and #$7F
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tax
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cpx #MAX_TYPES
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bcs heapCorrupt
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lda typeLen,x
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pha ; save length for later
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lda typeTblL,x
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sta .getoff+1
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lda typeTblH,x
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sta .getoff+2
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ldx #0 ; starts at len byte, which we immediately skip
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.getoff inx
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lda $1000,x ; self-modified above: get next pointer offset for type
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beq .nxtblk ; zero marks end of offset table
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tay
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iny ; not much we can do to validate lo byte, so skip it
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cpy tmp ; ensure offset is within type length
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beq + ; the very end is ok
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bcs corrup ; but not beyond
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+ lda (pTmp),y ; get hi byte of ptr
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beq + ; null is ok
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cmp #>heapStart ; else check if < start of heap
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bcc heapCorrupt
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cmp #>heapEnd ; or > than end of heap
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bcc .getoff
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heapCorrupt:
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ldx pTmp
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lda pTmp+1
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jsr prntax
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jsr inlineFatal : !text "HeapCorrupt",0
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; Phase 1 of Garbage Collection: mark accessible heap blocks starting from the root block
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gc1_mark: !zone
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ldx #0 ; clear the hash table
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stx gcHash_top
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txa
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- sta gcHash_first,x
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inx
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bne -
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lda #<heapStart ; global block is at very start of heap
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sta pSrc
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lda #>heapEnd
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sta pSrc+1
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sec
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jsr gcHash_chk ; seed the hash, and thus our queue, with the global block
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clv ; clear V flag to mark phase 1
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bvc .start
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; Phase 3 of Garbage Collection: fix all pointers
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gc3_fix:
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bit .rts ; set V flag to mark phase 3
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.start lda #0
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sta resNum ; initialize block counter (note: blk #0 in hash is not used)
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.outer inc resNum ; advance to next block in hash
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ldx resNum
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cpx gcHash_top ; finished all blocks?
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beq .trav ; last blk? if so still need to trav it
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bcs .rts ; or if past last blk, we're done
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.trav ldy gcHash_srcLo,x ; get pointer to block, lo byte first
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lda gcHash_srcHi,x ; then hi byte
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bvc +
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ldy gcHash_dstLo,x ; in pointer fix mode, use the block's final location
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lda gcHash_dstHi,x
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+ sty pTmp ; store object pointer so we can dereference it
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sta pTmp+1
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ldy #0 ; first byte
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lda (pTmp),y ; is the type
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bpl .outer ; or, if not hi bit, just a string so skip (no ptrs)
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and #$7F ; mask off hi bit to get type number
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tax
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lda typeTblL,x ; get pointer to type table
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sta .ldof+1
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lda typeTblH,x
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sta .ldof+2
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ldx #1 ; skip size byte, access first ptr offset
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.ldof lda $1111,x ; self-modified above: get offset entry
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beq .outer ; zero marks end of list -> go to next block
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tay
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lda (pTmp),y ; grab pointer at that offset
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sta pSrc
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sty .fix+1 ; save pointer offset for use if fixing pointers in phase 3
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iny
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lda (pTmp),y
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sta pSrc+1
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stx tmp+1 ; save index into type entry
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sec ; sec = we want to add to hash if it's not there
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bvc +
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clc ; in phase 3, we don't want to add to hash
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+ jsr gcHash_chk ; go add it to the hash; ignore return flag
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bvc + ; skip pointer fixing in phase 1
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bcc heapCorrupt ; in phase 3, pointer must be in hash!
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.fix ldy #11 ; restore pointer offset
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lda gcHash_dstLo,x ; get new location
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sta (pTmp),y ; update the pointer
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iny
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lda gcHash_dstHi,x ; hi byte too
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sta (pTmp),y
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+ ldx tmp+1 ; restore type entry index
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inx ; next offset entry
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bne .ldof ; always taken
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.rts rts ; this needs to be an RTS instruction - used to set V flag
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; Phase 2 of Garbage Collection: sweep all accessible blocks together
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gc2_sweep: !zone
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lda #<heapStart
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sta pSrc
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sta pDst
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lda #>heapStart
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sta pSrc+1
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sta pDst+1
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.outer clc ; clc = do not add to hash
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jsr gcHash_chk ; is this block in hash?
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; note: next 20 lines or so *must* preserve the carry flag
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bcc +
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lda pDst
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sta gcHash_dstLo,x ; record new address
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eor pSrc
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sta tmp
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lda pDst+1
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sta gcHash_dstHi,x ; in hash table
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eor pSrc+1
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ora tmp
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sta tmp ; this will be zero iff all 16 bits of pSrc == pDst
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+ ldy #0 ; index of type byte in heap block
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lda (pSrc),y ; ...still need to preserve carry flag...
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bpl .gotlen
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and #$7F
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tax
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lda typeLen,x
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.gotlen sta reqLen ; save len for later
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bcc .advSrc ; finally act on carry (hash check flg): if block not in hash, skip block
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tax ; and in index for copying
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lda tmp ; check for pSrc == pDst
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beq .advDst ; if equal, no need to copy
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+ inx ; set up to copy type byte as well
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.cplup lda (pSrc),y
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sta (pDst),y
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iny
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dex
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bne .cplup
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.advDst lda pDst ; advance dest
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sec ; +1 for type byte
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adc reqLen
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sta pDst
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bcc .advSrc
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inc pDst+1
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.advSrc lda pSrc ; advance source
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sec ; +1 for type byte
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adc reqLen
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sta pSrc
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bcc +
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inc pSrc+1
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+ cmp heapTop ; end of heap yet? (lo byte check)
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lda pSrc+1
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sbc heapTop+1 ; (hi byte check)
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bcc .outer ; if not, loop again
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rts
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doGC: !zone
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lda nHeapBlks
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bne + ; edge case: if nothing on heap, skip collection
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rts
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+ jsr gc1_mark ; mark reachable blocks
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jsr gc2_sweep ; sweep them into one place
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jsr gc3_fix ; adjust all pointers
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jmp heapClear ; and clear newly freed space
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} ; end of !pseodupc $800
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loMemEnd = *
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@ -453,10 +816,7 @@ grabSegment: !zone
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lda tSegLink,y ; no, grab next segment in list
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sta unusedSeg ; that is now first unused
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rts ; return with Y = the segment grabbed
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.fail: ldx #<+
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ldy #>+
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jmp fatalError
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+ !text "No more segments", 0
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.fail: jsr inlineFatal : !text "MaxSegs", 0
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;------------------------------------------------------------------------------
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releaseSegment: !zone
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@ -694,75 +1054,6 @@ saneEnd: !zone {
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}
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}
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;------------------------------------------------------------------------------
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; Print fatal error message (custom or predefined) and print the
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; call stack, then halt.
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fatalError: !zone
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sty pTmp+1 ; save message ptr hi...
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stx pTmp ; ...and lo
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jsr setnorm ; set up text mode and vectors
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bit setText
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jsr setvid
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jsr setkbd
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lda $24 ; check if we're already at start of screen line
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beq + ; no, no need for CR
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jsr crout ; carriage return to get to start of screen line
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+ ldy #40 ; set up to print 40 dashes
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lda #'-'
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.dash: jsr cout
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dey
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bne .dash
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.msg1: lda .prefix,y ; print out prefix message
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beq +
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jsr cout
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iny
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bne .msg1
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+ tay ; start at first byte of user message
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.msg2 lda (pTmp),y
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beq .msg3
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jsr cout
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iny
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bne .msg2
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.msg3:
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!if DEBUG {
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; Print call stack
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ldy #0
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.msg4 lda .stkMsg,y
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beq +
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jsr cout
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iny
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bne .msg4
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+ tsx ; start at current stack pointer
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.stackLoop:
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lda $101,x ; JSR increments PC twice before pushing it
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sec
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sbc #2
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tay
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lda $102,x
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sbc #0
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sta .load+2
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and #$F0 ; avoid accidentally grabbing data from the IO area
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cmp #$C0
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beq .next
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.load: lda $1000,y ; is there a JSR there?
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cmp #$20
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bne .next ; no, it's probably not an actual call
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lda .load+2
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jsr prbyte
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tya
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jsr prbyte
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lda #' '
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jsr cout
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.next: inx ; work up to...
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cpx #$FF ; ...top of stack
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bcc .stackLoop
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}
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jsr crout
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jsr bell ; beep
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.inf: jmp .inf ; and loop forever
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.prefix:!text "FATAL ERROR: ", 0
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.stkMsg:!text $8D,"Call stk: ", 0
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;------------------------------------------------------------------------------
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init: !zone
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; put something interesting on the screen :)
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@ -989,17 +1280,11 @@ reset: !zone
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;------------------------------------------------------------------------------
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outOfMemErr: !zone
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!if DEBUG { jsr main_debug }
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ldx #<+
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ldy #>+
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jmp fatalError
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+ !text "Out of mem", 0
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jsr inlineFatal : !text "OutOfMem", 0
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;------------------------------------------------------------------------------
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reservedErr: !zone
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ldx #<+
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ldy #>+
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jmp fatalError
|
||||
+ !text "Mem already alloc'd", 0
|
||||
jsr inlineFatal : !text "DblAlloc", 0
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
main_request: !zone
|
||||
@ -1176,10 +1461,7 @@ shared_scan: !zone
|
||||
+ rts
|
||||
|
||||
invalAddr: !zone
|
||||
ldx #<+
|
||||
ldy #>+
|
||||
jmp fatalError
|
||||
+ !text "Invalid addr", 0
|
||||
jsr inlineFatal : !text "InvalAdr", 0
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
; If the resource is a module, this will locate the corresponding bytecode
|
||||
@ -1264,10 +1546,7 @@ shared_free:
|
||||
and #$3F ; remove the 'active' and 'locked' flags
|
||||
sta tSegType,x ; store flags back
|
||||
.done rts ; all done
|
||||
.fatal ldx #<+
|
||||
ldy #>+
|
||||
jmp fatalError
|
||||
+ !text "Don't free bytecode.", 0
|
||||
.fatal jsr inlineFatal : !text "NoFreeBcode", 0
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
main_calcFree: !zone
|
||||
@ -1419,10 +1698,7 @@ diskLoader: !zone
|
||||
+ cmp #RESET_MEMORY
|
||||
bne +
|
||||
rts ; do nothing
|
||||
+ ldx #<+
|
||||
ldy #>+
|
||||
jmp fatalError
|
||||
+ !text "Invalid command", 0
|
||||
+ jsr inlineFatal : !text "InvalCmd", 0
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
openPartition: !zone
|
||||
@ -1470,18 +1746,16 @@ prodosError: !zone
|
||||
pla
|
||||
jsr .digit
|
||||
sta .num+1
|
||||
ldx #<.msg
|
||||
ldy #>.msg
|
||||
jmp fatalError
|
||||
jsr inlineFatal
|
||||
.msg: !text "ProDOSErr $"
|
||||
.num: !text "xx"
|
||||
!byte 0
|
||||
.digit: and #$F
|
||||
ora #$B0
|
||||
cmp #$BA
|
||||
bcc +
|
||||
adc #6
|
||||
+ rts
|
||||
.msg: !text "ProDOS error $"
|
||||
.num: !text "xx"
|
||||
!byte 0
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
disk_startLoad: !zone
|
||||
@ -1495,10 +1769,7 @@ disk_startLoad: !zone
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
sequenceError: !zone
|
||||
ldx #<+
|
||||
ldy #>+
|
||||
jmp fatalError
|
||||
+ !text "Bad sequence", 0
|
||||
jsr linlineFatal : !text "BadSeq", 0
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
startHeaderScan: !zone
|
||||
@ -1570,10 +1841,7 @@ disk_queueLoad: !zone
|
||||
jsr adjYpTmp ; keep it small
|
||||
jmp .scan ; go for more
|
||||
.notFound:
|
||||
ldx #<+
|
||||
ldy #>+
|
||||
jmp fatalError
|
||||
+ !text "Resource not found", 0
|
||||
jsr inlineFatal : !text "ResNotFnd", 0
|
||||
.resLen: !byte 0
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
@ -2219,11 +2487,11 @@ doAllFixups: !zone
|
||||
|
||||
!if DEBUG { !align 255,0 }
|
||||
|
||||
tSegLink = * : !fill MAX_SEGS
|
||||
tSegType = * : !fill MAX_SEGS
|
||||
tSegRes = * : !fill MAX_SEGS
|
||||
tSegAdrLo = * : !fill MAX_SEGS
|
||||
tSegAdrHi = * : !fill MAX_SEGS
|
||||
tSegLink !fill MAX_SEGS
|
||||
tSegType !fill MAX_SEGS
|
||||
tSegRes !fill MAX_SEGS
|
||||
tSegAdrLo !fill MAX_SEGS
|
||||
tSegAdrHi !fill MAX_SEGS
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
; Marker for end of the tables, so we can compute its length
|
||||
|
||||
Loading…
Reference in New Issue
Block a user