mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-27 22:12:25 +00:00
69 lines
No EOL
3 KiB
C#
69 lines
No EOL
3 KiB
C#
using System;
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using System.IO;
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using CPU = Indy.IL2CPU.Assembler;
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using CPUx86 = Indy.IL2CPU.Assembler.X86;
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using System.Reflection;
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using Indy.IL2CPU.Assembler;
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namespace Indy.IL2CPU.IL.X86 {
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[OpCode(OpCodeEnum.Unbox)]
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public class Unbox: Op {
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private int mTypeId;
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private string mThisLabel;
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private string mNextOpLabel;
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private Type mType;
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private uint mTypeSize;
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private uint mCurrentILOffset;
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private bool mDebugMode;
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public Unbox(ILReader aReader, MethodInformation aMethodInfo)
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: base(aReader, aMethodInfo) {
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mType = aReader.OperandValueType;
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if (mType == null) {
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throw new Exception("Unable to determine Type!");
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}
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mTypeSize = Engine.GetFieldStorageSize(mType);
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mTypeId = Engine.RegisterType(mType);
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mThisLabel = GetInstructionLabel(aReader);
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mNextOpLabel = GetInstructionLabel(aReader.NextPosition);
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mCurrentILOffset = aReader.Position;
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mDebugMode = aMethodInfo.DebugMode;
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}
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public override void DoAssemble() {
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string mReturnNullLabel = mThisLabel + "_ReturnNull";
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new CPUx86.Move { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.ESP, SourceIsIndirect = true };
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new CPUx86.Compare { DestinationReg = CPUx86.Registers.EAX, SourceValue = 0 };
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new CPUx86.JumpIfZero(mReturnNullLabel);
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new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX, DestinationIsIndirect = true };
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Assembler.StackContents.Push(new StackContent(4, typeof(uint)));
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new CPUx86.Push { DestinationValue = (uint)mTypeId };
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Assembler.StackContents.Push(new StackContent(4, typeof(uint)));
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MethodBase xMethodIsInstance = Engine.GetMethodBase(Engine.GetType("", "Indy.IL2CPU.VTablesImpl"), "IsInstance", "System.Int32", "System.Int32");
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Engine.QueueMethod(xMethodIsInstance);
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Op xOp = new Call(xMethodIsInstance, mCurrentILOffset, mDebugMode, mThisLabel + "_After_IsInstance_Call");
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xOp.Assembler = Assembler;
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xOp.Assemble();
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new Label(mThisLabel + "_After_IsInstance_Call");
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new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
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Assembler.StackContents.Pop();
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new CPUx86.Compare { DestinationReg = CPUx86.Registers.EAX, SourceValue = 0 };
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new CPUx86.JumpIfEqual(mReturnNullLabel);
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new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
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uint xSize = mTypeSize;
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if (xSize % 4 > 0) {
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xSize += 4 - (xSize % 4);
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}
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int xItems =(int) xSize /4;
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for (int i = xItems - 1; i >= 0; i--) {
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new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX, DestinationIsIndirect = true, DestinationDisplacement = ((i * 4) + ObjectImpl.FieldDataOffset) };
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}
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Assembler.StackContents.Push(new StackContent((int)mTypeSize, mType));
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new CPUx86.Jump(mNextOpLabel);
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new CPU.Label(mReturnNullLabel);
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new CPUx86.Add { DestinationReg = CPUx86.Registers.ESP, SourceValue = 4 };
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new CPUx86.Push { DestinationValue = 0 };
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Assembler.StackContents.Push(new StackContent(4, typeof(object)));
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}
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}
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} |