93 lines
2.2 KiB
Kotlin
93 lines
2.2 KiB
Kotlin
import java.io.*
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enum class OpCode(val opcode: Int, val useM: Boolean, val useADR: Boolean, val useReg: Boolean = true) {
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LOAD(0, true, true),
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STORE(1, true, true),
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ADD(2, true, true),
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SUB(3, true, true),
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AND(4, true, true),
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LSR(5, true, true),
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BRA(6, false, true),
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BNE(7, false, true),
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CMP(8, true, false),
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BEQ(9, false, true),
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HALT(15, false, false, false)
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}
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enum class Mode(val id: Int) {
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DIRECT(0), IMMEDIATE(1), INDIRECT(2), INDEXED(3)
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}
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interface Instruction {
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fun getData(insns: Iterable<Instruction>): Short
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}
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class Label(val name: String): Instruction {
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override fun getData(insns: Iterable<Instruction>) = 0.toShort()
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}
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class Immediate(val data: Short): Instruction {
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override fun getData(insns: Iterable<Instruction>) = data
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}
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class Operation(val code: OpCode, val reg: Int, val m: Mode, val adr: AddressReference): Instruction {
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constructor(val code: OpCode): this(code, 0, Mode.DIRECT, AddressReference(0))
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override fun getData(insns: Iterable<Instruction>): Short {
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return code.opcode
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.and(0b1111)
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.shl(12)
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.or(
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if(code.useReg) reg.and(0b11).shl(10)
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else 0
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)
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.or(
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if(code.useM) m.id.and(0b11).shl(8)
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else 0
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)
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.or(
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if(code.useADR) adr.getAddress(insns).and(0b11111111)
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else 0
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)
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.toShort()
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}
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}
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class AddressReference(private val label: Label?, private val absolute: Int?) {
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constructor(label: Label): this(label, null)
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constructor(absolute: Int): this(null, absolute)
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fun getAddress(insns: Iterable<Instruction>): Int {
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if(absolute != null) return absolute
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insns.forEachIndexed{ index, insn ->
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if(insn == label)
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return@getAddress index*2
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}
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throw RuntimeException("Label cannot be found in set of instructions!")
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}
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}
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fun main(args: Array<String>){
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// Ensure correct argument length 'n stuff
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if(args.size != 1){
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System.err.println("Invalid argument length!")
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System.exit(-1)
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}
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val file = File(args[0])
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// Make sure we have a valid file
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if(!file.isFile){
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System.err.println("Given file doesn't exist!")
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System.exit(-2)
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}
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val insns = ArrayList<Instruction>()
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insns.add(Operation(OpCode.LOAD, 0, Mode.DIRECT, AddressReference(1337)))
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insns.add(Operation(OpCode.HALT))
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}
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