Working Forthy example!
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50
asm.fnl
50
asm.fnl
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@ -77,7 +77,7 @@
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(fn parse-mode-arg [op]
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(match op
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[_ :a] [:a nil]
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([_ imm] ? (= (type imm) "number")) [:imm imm]
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([_ imm] ? (or (= (type imm) "number") (= (type imm) "function"))) [:imm imm]
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([opcode addr] ? (and (= (type addr) "string") (= (opcode:sub 1 1) "b"))) [:rel addr] ; branch
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[_ addr :x] [:addr-x addr]
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[_ [addr] :y] [:zp*-y addr]
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@ -92,20 +92,20 @@
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; takes the form [:op args]
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; pdat - a parsed dat; takes the form {:type type :addr addr ...}
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(local dat-parser {})
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(fn new-block [] {:type :block :pdats [] :symbols {}})
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(fn parse-dats [block dats]
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(var index (+ (length block.pdats) 1))
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(each [_ dat (ipairs dats)]
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(if (= (type dat) "string")
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(tset block.symbols dat index)
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(tset block.symbols dat (+ (length block.pdats) 1))
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(let [opcode (. dat 1)
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parser (. dat-parser opcode)
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pdat
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(if
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parser (parser dat)
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parser (parser dat block)
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(. opcodes opcode) (dat-parser.op dat)
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(error (.. "Unrecognized opcode " (fv opcode))))]
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(table.insert block.pdats pdat)
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(set index (+ index 1)))))
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(table.insert block.pdats pdat))))
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block)
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(fn dat-parser.op [op]
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@ -115,11 +115,14 @@
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(fn dat-parser.block [block]
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(let [dats (table.clone block)]
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(table.remove dats 1)
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(parse-dats {:type :block :pdats [] :symbols {}} dats)))
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(parse-dats (new-block) dats)))
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(fn dat-parser.db [db] {:type :var :init (. db 2) :size 1})
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(fn dat-parser.dw [dw] {:type :var :init (. dw 2) :size 2})
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(fn dat-parser.bytes [bytes] {:type :raw : bytes})
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(fn dat-parser.ref [ref] {:type :ref :target (. ref 2)})
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(fn dat-parser.flatten [flat block]
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(parse-dats block (lume.slice flat 2)))
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(fn make-env [block parent]
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{:parent parent
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@ -137,18 +140,26 @@
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(self.parent:lookup-addr name)))})
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(fn lo [v] (bit.band v 0xff))
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(fn hi [v] (bit.band (bit.rshift v 8) 0xff))
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(fn int8-to-bytes [i]
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(string.char (bit.band i 0xff)))
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(string.char (lo i)))
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(fn int16-to-bytes [i]
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(string.char (bit.band i 0xff) (bit.band (bit.rshift i 8) 0xff)))
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(string.char (lo i) (hi i)))
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(local pdat-processor {
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:op {}
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:var {}
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:ref {}
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:raw {}
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:block {}
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})
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(fn process-pdat [pdat process default ...]
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(local processor (. pdat-processor pdat.type process))
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(if processor (processor pdat ...) default))
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(fn pdat-processor.op.patch [op env]
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(when (and op.mode (= (op.mode:sub 1 4) :addr))
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(let [zp-mode (.. :zp (op.mode:sub 5))
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@ -159,6 +170,7 @@
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(fn pdat-processor.raw.size [raw] (length raw.bytes))
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(fn pdat-processor.op.size [op] (size op.mode))
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(fn pdat-processor.var.size [d] d.size)
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(fn pdat-processor.ref.size [r] 2)
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(fn pdat-processor.op.bytes [op env]
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(local bytegen (. opcodes op.opcode))
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@ -167,11 +179,14 @@
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(let [opbyte (bytegen op.mode)
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argbytes
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(if
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(and (= op.mode :imm) (= (type op.arg) "function"))
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(int8-to-bytes (op.arg env))
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(= op.mode :imm) (int8-to-bytes op.arg)
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(= op.mode :rel)
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(int8-to-bytes (- (env:lookup-addr op.arg env) (+ op.addr 2)))
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(= (size op.mode) 2) (int8-to-bytes (env:lookup-addr op.arg env))
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(= (size op.mode) 3) (int16-to-bytes (env:lookup-addr op.arg env))
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(int8-to-bytes (- (env:lookup-addr op.arg) (+ op.addr 2)))
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(= (size op.mode) 2) (int8-to-bytes (env:lookup-addr op.arg))
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(= (size op.mode) 3) (int16-to-bytes (env:lookup-addr op.arg))
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"")]
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(if opbyte
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(.. (int8-to-bytes opbyte) argbytes)
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@ -182,10 +197,8 @@
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1 (int8-to-bytes (or d.init 0))
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2 (int16-to-bytes (or d.init 0))
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n (string.rep "\0" n)))
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(fn process-pdat [pdat process default ...]
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(local processor (. pdat-processor pdat.type process))
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(if processor (processor pdat ...) default))
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(fn pdat-processor.ref.bytes [ref env]
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(int16-to-bytes (env:lookup-addr ref.target)))
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(fn pdat-processor.block.symbols [block]
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(lume.keys block.symbols))
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@ -226,7 +239,7 @@
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(fn [self org]
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(var block (. self.org-to-block org))
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(when (not block)
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(set block {:type :block :pdats [] :symbols {}})
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(set block (new-block))
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(tset self.org-to-block org block))
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{: block
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:append (fn [self ...] (parse-dats self.block [...]) self)})
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@ -267,4 +280,5 @@
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(machine:write org block.bytes)))
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})
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{: program}
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{: program : dat-parser : pdat-processor : new-block : parse-dats : lo : hi}
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89
test.fnl
89
test.fnl
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@ -1,21 +1,36 @@
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(local {: program} (require "asm"))
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(local {: program : dat-parser : new-block : parse-dats : lo : hi} (require "asm"))
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(local {: stream : kvstream : one} (require "stream"))
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(local prg (program))
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(local code1 (prg:org 0xc00))
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; (prg:block :print-chars-forever 0x0c00
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; :start
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; [:dex]
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; [:txa]
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; [:jsr :0xfded]
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; [:jmp :start])
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(fn dat-parser.vm [bytecodes]
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(local block (new-block))
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(each [_ bytecode (ipairs (lume.slice bytecodes 2))]
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(if
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(= (type bytecode) :number)
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(parse-dats block [[:ref :lit] [:dw bytecode]])
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(= (type bytecode) :string)
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(parse-dats block [[:ref bytecode]])
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(= (type bytecode) :table)
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(parse-dats block bytecode)
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(error (.. "VM can't parse " (fv bytecode)))))
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block)
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(local mon {
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:hexout :0xfdda
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:putchar :0xfded
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:bell :0xff3a
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})
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(local vm {
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:IP :0x40
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:IPH :0x41
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:W :0x42
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:WH :0x43
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:ROFF :0x44
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:IP :0x60
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:IPH :0x61
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:W :0x62
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:WH :0x63
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:ROFF :0x64
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:TOP :0x80
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:TOPH :0x81
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:ST1 :0x7e
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@ -40,7 +55,11 @@
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:def
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(fn [self name ...]
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(code1:append name (table.unpack (lume.concat [...] [(self:ret)]))))
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:word
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(fn [self name ...]
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(code1:append name [:jsr :subroutine] [:vm ...] [:vm :ret]))
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})
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(fn inc16 [l h]
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[:block
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[:inc l]
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@ -50,27 +69,38 @@
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])
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(fn add16 [l h]
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[:block
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[:clc]
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[:adc l]
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[:sta l]
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[:bcc :go]
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[:inc h]
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:go
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])
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(code1:append :next
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[:lda vm.IP] [:sta vm.W]
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[:lda vm.IPH] [:sta vm.WH]
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[:lda 2] (add16 vm.IP vm.IPH)
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[:ldy 0]
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[:lda [vm.IP] :y] [:sta vm.W]
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(inc16 vm.IP vm.IPH)
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[:lda [vm.IP] :y] [:sta vm.WH]
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(inc16 vm.IP vm.IPH)
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[:jmp [vm.W]])
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(vm:def
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[:pla] [:sta vm.IP] [:pla] [:sta vm.IPH]
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(inc16 vm.IP vm.IPH))
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(code1:append :reset
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[:lda #(lo ($1:lookup-addr :quit))]
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[:sta vm.IP]
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[:lda #(hi ($1:lookup-addr :quit))]
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[:sta vm.IPH]
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[:lda 0]
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[:sta vm.ROFF]
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[:ldx 0xfe]
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[:rts])
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(vm:def
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:subroutine ; usage: [jsr :subroutine] followed by bytecode
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[:ldy vm.ROFF]
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[:lda vm.IP] [:sta vm.RSTACK :y] [:iny]
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[:lda vm.IPH] [:sta vm.RSTACK :y] [:iny]
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[:sty vm.ROFF]
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:interpret ; usage: [jsr :interpret] followed by bytecode
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[:pla] [:sta vm.IP] [:pla] [:sta vm.IPH]
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(inc16 vm.IP vm.IPH))
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@ -147,10 +177,25 @@
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(vm:def :lit
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[:inx] [:inx] [:ldy 0]
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[:lda [vm.IP] :y] [:sta [vm.TOP :x]]
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[:lda [vm.IPH] :y] [:sta [vm.TOP :x]]
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[:lda 2] (add16 vm.IP vm.IPH))
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[:lda [vm.IP] :y] [:sta vm.TOP :x]
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(inc16 vm.IP vm.IPH)
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[:lda [vm.IP] :y] [:sta vm.TOPH :x]
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(inc16 vm.IP vm.IPH))
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(vm:def :.
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[:lda vm.TOPH :x]
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[:jsr mon.hexout]
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[:lda vm.TOP :x]
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[:jsr mon.hexout]
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[:lda (string.byte " ") ]
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[:jsr mon.putchar]
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(vm:drop))
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(code1:append :main
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[:jsr :reset]
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[:jsr :interpret]
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[:vm 0xbabe 0xcafe :. :. :quit])
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(prg:assemble)
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(set prg.start-symbol :mixed-hires)
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prg
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