mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-20 21:08:51 +00:00
58 lines
No EOL
2.3 KiB
C#
58 lines
No EOL
2.3 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.Castclass, false)]
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public class Castclass: 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 mCastAsType;
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private int mCurrentILOffset;
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private MethodInformation mMethodInfo;
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public Castclass(ILReader aReader, MethodInformation aMethodInfo)
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: base(aReader, aMethodInfo) {
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Type xType = aReader.OperandValueType;
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if (xType == null) {
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throw new Exception("Unable to determine Type!");
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}
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mCastAsType = xType;
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mTypeId = Engine.RegisterType(mCastAsType);
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mThisLabel = GetInstructionLabel(aReader);
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mNextOpLabel = GetInstructionLabel(aReader.NextPosition);
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mCurrentILOffset = (int)aReader.Position;
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mMethodInfo = aMethodInfo;
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}
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public override void DoAssemble() {
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// todo: throw an exception when the class does not support the cast!
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string mReturnNullLabel = mThisLabel + "_ReturnNull";
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new CPUx86.Move(CPUx86.Registers.EAX, CPUx86.Registers.AtESP);
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new CPUx86.Compare(CPUx86.Registers.EAX, "0");
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new CPUx86.JumpIfZero(mReturnNullLabel);
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new CPUx86.Pushd(CPUx86.Registers.AtEAX);
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new CPUx86.Pushd("0x" + mTypeId.ToString("X") );
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Assembler.StackContents.Push(new StackContent(4, typeof(object)));
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Assembler.StackContents.Push(new StackContent(4, typeof(object)));
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MethodBase xMethodIsInstance = Engine.GetMethodBase(typeof(VTablesImpl), "IsInstance", "System.Int32", "System.Int32");
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Engine.QueueMethod(xMethodIsInstance);
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Op xOp = new Call(xMethodIsInstance, mCurrentILOffset);
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xOp.Assembler = Assembler;
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xOp.Assemble();
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Assembler.StackContents.Pop();
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new CPUx86.Pop(CPUx86.Registers.EAX);
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new CPUx86.Compare(CPUx86.Registers.EAX, "0");
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new CPUx86.JumpIfNotEquals(mNextOpLabel);
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new CPU.Label(mReturnNullLabel);
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new CPUx86.Add("esp", "4");
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Newobj.Assemble(Assembler, typeof(InvalidCastException).GetConstructor(new Type[0]), Engine.RegisterType(typeof(InvalidCastException)), mThisLabel, mMethodInfo, mCurrentILOffset);
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Call.EmitExceptionLogic(Assembler, mCurrentILOffset, mMethodInfo, mNextOpLabel, false, null);
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}
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}
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} |