mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-19 20:39:01 +00:00
57 lines
2.7 KiB
C#
57 lines
2.7 KiB
C#
using System;
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using CPU = Cosmos.Assembler.x86;
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using CPUx86 = Cosmos.Assembler.x86;
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using Cosmos.IL2CPU.ILOpCodes;
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using Cosmos.Assembler;
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using Cosmos.IL2CPU.Plugs.System;
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using XSharp.Compiler;
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using SysReflection = System.Reflection;
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namespace Cosmos.IL2CPU.X86.IL
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{
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[Cosmos.IL2CPU.OpCode(ILOpCode.Code.Unbox_Any)]
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public class Unbox_Any : ILOp
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{
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public Unbox_Any(Cosmos.Assembler.Assembler aAsmblr)
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: base(aAsmblr)
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{
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}
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public override void Execute(MethodInfo aMethod, ILOpCode aOpCode)
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{
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DoNullReferenceCheck(Assembler, DebugEnabled, 0);
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OpType xType = (OpType)aOpCode;
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string xBaseLabel = GetLabel(aMethod, aOpCode) + ".";
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string xTypeID = GetTypeIDLabel(xType.Value);
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uint xTypeSize = SizeOfType(xType.Value);
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string mReturnNullLabel = xBaseLabel + "_ReturnNull";
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new CPUx86.Compare { DestinationReg = CPUx86.RegistersEnum.ESP, DestinationIsIndirect = true, SourceValue = 0 };
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new CPUx86.ConditionalJump { Condition = CPUx86.ConditionalTestEnum.Zero, DestinationLabel = mReturnNullLabel };
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new CPUx86.Mov { DestinationReg = CPUx86.RegistersEnum.EAX, SourceReg = CPUx86.RegistersEnum.ESP, SourceIsIndirect = true };
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new CPUx86.Push { DestinationReg = CPUx86.RegistersEnum.EAX, DestinationIsIndirect = true };
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new CPUx86.Push { DestinationRef = Cosmos.Assembler.ElementReference.New(xTypeID), DestinationIsIndirect = true };
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SysReflection.MethodBase xMethodIsInstance = ReflectionUtilities.GetMethodBase(typeof(VTablesImpl), "IsInstance", "System.UInt32", "System.UInt32");
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Call.DoExecute(Assembler, aMethod, xMethodIsInstance, aOpCode, GetLabel(aMethod, aOpCode), xBaseLabel + "_After_IsInstance_Call", DebugEnabled);
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new Label(xBaseLabel + "_After_IsInstance_Call");
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XS.Pop(XSRegisters.OldToNewRegister(CPU.RegistersEnum.EAX));
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XS.Compare(XSRegisters.OldToNewRegister(CPU.RegistersEnum.EAX), 0);
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new CPU.ConditionalJump { Condition = CPU.ConditionalTestEnum.Equal, DestinationLabel = mReturnNullLabel };
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XS.Pop(XSRegisters.OldToNewRegister(CPU.RegistersEnum.EAX));
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uint xSize = xTypeSize;
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if (xSize % 4 > 0)
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{
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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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{
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new CPU.Push { DestinationReg = CPU.RegistersEnum.EAX, DestinationIsIndirect = true, DestinationDisplacement = ((i * 4) + ObjectImpl.FieldDataOffset) };
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}
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new CPU.Jump { DestinationLabel = GetLabel(aMethod, aOpCode.NextPosition) };
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new Label(mReturnNullLabel);
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XS.Add(XSRegisters.OldToNewRegister(CPU.RegistersEnum.ESP), 4);
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new CPUx86.Push { DestinationValue = 0 };
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}
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}
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}
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