mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-23 06:18:54 +00:00
64 lines
2.5 KiB
C#
64 lines
2.5 KiB
C#
using System;
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using CPUx86 = Cosmos.Assembler.x86;
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using CPU = Cosmos.Assembler.x86;
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using Cosmos.Assembler;
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using System.Reflection;
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using Cosmos.IL2CPU.Plugs.System;
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using XSharp.Compiler;
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using static XSharp.Compiler.XSRegisters;
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namespace Cosmos.IL2CPU.X86.IL
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{
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/// <summary>
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/// Pushes an object reference to a new zero-based, one-dimensional array whose elements are of a specific type onto the evaluation stack.
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/// </summary>
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[Cosmos.IL2CPU.OpCode(ILOpCode.Code.Newarr)]
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public class Newarr : ILOp
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{
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public Newarr(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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Cosmos.IL2CPU.ILOpCodes.OpType xType = (Cosmos.IL2CPU.ILOpCodes.OpType)aOpCode;
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uint xSize = SizeOfType(xType.Value);
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//TODO cache it to reduce calculation
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string xTypeID = GetTypeIDLabel(typeof(Array));
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MethodBase xCtor = typeof(Array).GetConstructors(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance)[0];
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string xCtorName = LabelName.Get(xCtor);
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new Comment(Assembler, "Element Size = " + xSize);
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// element count is on the stack
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XS.Pop(XSRegisters.ESI);
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XS.Push(XSRegisters.ESI);
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//Assembler.StackSizes.Push(xElementCountSize);
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XS.Push(xSize);
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new Mul(Assembler).Execute(aMethod, aOpCode);
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// the total items size is now on the stack
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XS.Push((ObjectImpl.FieldDataOffset + 4));
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new Add(Assembler).Execute(aMethod, aOpCode);
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// the total array size is now on the stack.
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XS.Call(LabelName.Get(GCImplementationRefs.AllocNewObjectRef));
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XS.Push(ESP, isIndirect: true);
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XS.Push(ESP, isIndirect: true);
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// it's on the stack 3 times now, once from the return value, twice from the pushes;
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XS.Pop(XSRegisters.EAX);
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XS.Set(EAX, EAX, sourceIsIndirect: true);
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XS.Set(EBX, xTypeID, sourceIsIndirect: true);
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XS.Set(EAX, EBX, destinationIsIndirect: true);
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XS.Add(XSRegisters.EAX, 4);
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new CPUx86.Mov { DestinationReg = CPUx86.RegistersEnum.EAX, DestinationIsIndirect = true, SourceValue = (uint)InstanceTypeEnum.Array, Size = 32 };
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XS.Add(XSRegisters.EAX, 4);
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XS.Set(EAX, ESI, destinationIsIndirect: true, size: RegisterSize.Int32);
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XS.Add(XSRegisters.EAX, 4);
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new CPUx86.Mov { DestinationReg = CPUx86.RegistersEnum.EAX, DestinationIsIndirect = true, SourceValue = (uint)xSize, Size = 32 };
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XS.Call(xCtorName);
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}
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}
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}
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