mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-27 22:12:25 +00:00
113 lines
4.3 KiB
C#
113 lines
4.3 KiB
C#
using System;
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using XSharp.Compiler;
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using CPUx86 = Cosmos.Assembler.x86;
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using Label = Cosmos.Assembler.Label;
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namespace Cosmos.IL2CPU.X86.IL
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{
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[Cosmos.IL2CPU.OpCode(ILOpCode.Code.Conv_Ovf_I_Un)]
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public class Conv_Ovf_I_Un: ILOp
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{
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public Conv_Ovf_I_Un(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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//TODO: What if the last ILOp in a method was Conv_Ovf_I_Un or an other?
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var xSource = aOpCode.StackPopTypes[0];
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var xSourceSize = SizeOfType(xSource);
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var xSourceIsFloat = TypeIsFloat(xSource);
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if(xSourceIsFloat)
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ThrowNotImplementedException("Conv_Ovf_I_Un throws an ArgumentException, because float is not implemented!");
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switch (xSourceSize)
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{
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case 1:
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case 2:
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case 4:
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break;
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case 8:
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{
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string NoOverflowLabel = GetLabel(aMethod, aOpCode) + "__NoOverflow";
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XS.Pop(XSRegisters.EAX);
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// EBX is high part and should be zero for unsigned, so we test it on zero
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{
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XS.Pop(XSRegisters.EBX);
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XS.Compare(XSRegisters.EBX, 0);
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XS.Jump(CPUx86.ConditionalTestEnum.Equal, NoOverflowLabel);
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ThrowNotImplementedException("Conv_Ovf_I_Un throws an overflow exception, which is not implemented!");
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}
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XS.Label(NoOverflowLabel);
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XS.Push(XSRegisters.EAX);
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break;
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}
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default:
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ThrowNotImplementedException("Conv_Ovf_I_Un not implemented for this size!");
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break;
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}
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}
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// using System;
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// using System.IO;
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// using CPU = Cosmos.Assembler.x86;
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// using Cosmos.IL2CPU.X86;
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// using CPUx86 = Cosmos.Assembler.x86;
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//
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// namespace Cosmos.IL2CPU.IL.X86 {
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// [Cosmos.Assembler.OpCode(OpCodeEnum.Conv_Ovf_I_Un)]
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// public class Conv_Ovf_I_Un : Op {
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// private readonly string NextInstructionLabel;
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// private string mNextLabel;
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// private string mCurLabel;
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// private uint mCurOffset;
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// private MethodInformation mMethodInformation;
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//
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// public Conv_Ovf_I_Un(ILReader aReader,
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// MethodInformation aMethodInfo)
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// : base(aReader,
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// aMethodInfo) {
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// mMethodInformation = aMethodInfo;
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// mCurOffset = aReader.Position;
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// mCurLabel = IL.Op.GetInstructionLabel(aReader);
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// mNextLabel = IL.Op.GetInstructionLabel(aReader.NextPosition);
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// NextInstructionLabel = GetInstructionLabel(aReader.NextPosition);
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// }
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//
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// public override void DoAssemble() {
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// var xSource = Assembler.Stack.Pop();
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// switch (xSource.Size) {
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// case 1:
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// case 2:
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// case 4: {
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// break;
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// }
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// case 8: {
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// XS.Pop(XSRegisters.EAX);
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// XS.Add(XSRegisters.ESP, 4);
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// XS.Push(XSRegisters.EAX);
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// //new CPUx86.Pop(CPUx86.Registers_Old.EAX);
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// //new CPUx86.SignExtendAX(4);
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// ////all bits of EDX == sign (EAX)
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// //new CPUx86.Pop("EBX");
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// ////must be equal to EDX
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// //new CPUx86.Xor("EBX",
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// // "EDX");
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// //new CPUx86.JumpIfZero(NextInstructionLabel);
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// ////equals
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// //newCPUx86.Interr upt(CPUx86.Interrupt.INTO);
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// break;
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// }
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// default:
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// EmitNotImplementedException(Assembler, GetServiceProvider(), "Conv_Ovf_I_Un: SourceSize " + xSource + " not supported!", mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
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// break;
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// }
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// Assembler.Stack.Push(new StackContent(4,
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// true,
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// false,
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// false));
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// }
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// }
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// }
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}
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}
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