mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-30 12:50:19 +00:00
60 lines
No EOL
2 KiB
C#
60 lines
No EOL
2 KiB
C#
using System;
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using System.IO;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using CPU = Indy.IL2CPU.Assembler;
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using CPUx86 = Indy.IL2CPU.Assembler.X86;
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namespace Indy.IL2CPU.IL.X86 {
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[OpCode(Code.Ldelem_Any, true)]
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public class Ldelem_Any: Op {
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private int mElementSize;
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public Ldelem_Any(Instruction aInstruction, MethodInformation aMethodInfo)
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: base(aInstruction, aMethodInfo) {
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TypeReference xType = aInstruction.Operand as TypeReference;
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if (xType == null)
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throw new Exception("Unable to determine Type!");
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mElementSize = Engine.GetFieldStorageSize(xType);
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}
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// todo: refactor all Ldelem variants to use this method for emitting
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public static void Assemble(CPU.Assembler aAssembler, int aElementSize) {
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aAssembler.Add(new CPUx86.Pop("eax"));
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aAssembler.Add(new CPUx86.Move("edx", "0" + aElementSize.ToString("X") + "h"));
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aAssembler.Add(new CPUx86.Multiply("edx"));
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aAssembler.Add(new CPUx86.Add("eax", "0" + (ObjectImpl.FieldDataOffset + 4).ToString("X") + "h"));
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aAssembler.Add(new CPUx86.Pop("edx"));
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aAssembler.Add(new CPUx86.Add("edx", "eax"));
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aAssembler.Add(new CPUx86.Move("eax", "edx"));
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int xSizeLeft = aElementSize;
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while(xSizeLeft > 0) {
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if(xSizeLeft >= 4) {
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aAssembler.Add(new CPUx86.Push("dword [eax]"));
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aAssembler.Add(new CPUx86.Add("eax", "4"));
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xSizeLeft -= 4;
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}else {
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if(xSizeLeft >= 2) {
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aAssembler.Add(new CPUx86.Push("word [eax]"));
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aAssembler.Add(new CPUx86.Add("eax", "2"));
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xSizeLeft -= 2;
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}else {
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if(xSizeLeft >= 1) {
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aAssembler.Add(new CPUx86.Push("byte [eax]"));
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aAssembler.Add(new CPUx86.Add("eax", "1"));
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xSizeLeft -= 1;
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}else {
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throw new Exception("Size left: " + xSizeLeft);
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}
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}
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}
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}
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aAssembler.StackSizes.Pop();
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aAssembler.StackSizes.Pop();
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aAssembler.StackSizes.Push(aElementSize);
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}
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public override void DoAssemble() {
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Assemble(Assembler, mElementSize);
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}
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}
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} |