mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-27 22:12:25 +00:00
80 lines
No EOL
2.5 KiB
C#
80 lines
No EOL
2.5 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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namespace Indy.IL2CPU.IL.X86 {
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[OpCode(OpCodeEnum.Blt)]
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public class Blt: Op {
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public readonly string TargetLabel;
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public readonly string CurInstructionLabel;
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public readonly string NextInstructionLabel;
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public Blt(ILReader aReader, MethodInformation aMethodInfo)
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: base(aReader, aMethodInfo) {
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TargetLabel = GetInstructionLabel(aReader.OperandValueBranchPosition);
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CurInstructionLabel = GetInstructionLabel(aReader);
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NextInstructionLabel = GetInstructionLabel(aReader.NextPosition);
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}
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public override void DoAssemble() {
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if (Assembler.StackContents.Peek().IsFloat) {
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throw new Exception("Floats not yet supported!");
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}
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var right = Assembler.StackContents.Pop();
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var left = Assembler.StackContents.Pop();
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if (right.Size != left.Size)
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throw new NotImplementedException("mixed size operations are not implemented");
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int xSize = right.Size;
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if (xSize > 8)
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throw new NotImplementedException("StackSize>8 not supported");
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string BaseLabel = CurInstructionLabel + "__";
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string LabelTrue = BaseLabel + "True";
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string LabelFalse = BaseLabel + "False";
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switch(xSize)
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{
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case 4:
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new CPUx86.Pop(CPUx86.Registers.ECX);
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//if (xSize > 4)
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//{
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// throw new NotImplementedException("long comprasion is not implemented");
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// new CPUx86.Add("esp", "4");
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//}
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new CPUx86.Pop(CPUx86.Registers.EAX);
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//if (xSize > 4)
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//{
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// throw new NotImplementedException("long comprasion is not implemented");
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// new CPUx86.Add("esp", "4");
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//}
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new CPUx86.Pushd(CPUx86.Registers.ECX);
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new CPUx86.Compare(CPUx86.Registers.EAX, CPUx86.Registers.AtESP);
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new CPUx86.JumpIfLess(LabelTrue);
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new CPUx86.Jump(LabelFalse);
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new CPU.Label(LabelTrue);
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new CPUx86.Add(CPUx86.Registers.ESP, "4");
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new CPUx86.Jump(TargetLabel);
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new CPU.Label(LabelFalse);
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new CPUx86.Add(CPUx86.Registers.ESP, "4");
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break;
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case 8:
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new CPUx86.Pop(CPUx86.Registers.EAX);
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new CPUx86.Pop(CPUx86.Registers.EDX);
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//value2: EDX:EAX
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new CPUx86.Pop("ebx");
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new CPUx86.Pop("ecx");
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//value1: ECX:EBX
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new CPUx86.Sub("ebx", "eax");
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new CPUx86.SubWithCarry("ecx", "edx");
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//result = value1 - value2
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new CPUx86.JumpIfLess(TargetLabel);
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break;
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default:
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throw new NotSupportedException(string.Format("comprasion of {0} byte values", xSize));
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}
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}
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}
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} |