60 lines
1.6 KiB
C#
60 lines
1.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Text;
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using System.Linq;
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namespace SVM.Instructions
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{
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class ADD : Instruction
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{
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public override string ASM => "ADD";
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public override byte OP => 0x21;
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public override byte[] Encode(string asm, Dictionary<string, ushort> markerRefs)
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{
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var parts = asm.Split(" ", 2);
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Debug.Assert(parts.Length == 2);
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var reg = Register.FromASM(parts[0]);
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var bc = new byte[] { OP, reg };
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return bc.Concat(Location.FromASM(parts[1]).Encode());
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}
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public override byte[] Decode(VM vm)
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{
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var pc = vm.PC;
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vm.PC += 1 + Location.SIZE;
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return vm.MEM.Subset(pc, 1 + Location.SIZE);
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}
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public override void Exec(VM vm, byte[] vars)
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{
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Debug.Assert(vars.Length > 1);
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var reg = vars[0];
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if (reg > VM.REGISTERS)
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{
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throw new Fault(FaultType.IllegalOp);
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}
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var loc = Location.FromByteCode(vars, 1);
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Run(vm, reg, loc);
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}
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protected virtual void Run(VM vm, byte reg, Location loc)
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{
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vm.R[reg] += loc.Read(vm);
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}
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public override string ToASM(byte[] vars)
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{
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Debug.Assert(vars.Length == 1 + Location.SIZE);
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var reg = vars[0];
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var loc = Location.FromByteCode(vars, 1);
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return string.Format("{0} {1} {2}", ASM, Register.ToASM(reg), loc.ToASM());
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}
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}
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}
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