mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-20 12:58:39 +00:00
66 lines
No EOL
2.4 KiB
C#
66 lines
No EOL
2.4 KiB
C#
using System;
|
|
using System.IO;
|
|
|
|
|
|
using CPU = Indy.IL2CPU.Assembler;
|
|
using CPUx86 = Indy.IL2CPU.Assembler.X86;
|
|
using System.Reflection;
|
|
using Indy.IL2CPU.Assembler;
|
|
|
|
namespace Indy.IL2CPU.IL.X86 {
|
|
[OpCode(OpCodeEnum.Unbox)]
|
|
public class Unbox: Op {
|
|
private int mTypeId;
|
|
private string mThisLabel;
|
|
private string mNextOpLabel;
|
|
private Type mType;
|
|
private int mTypeSize;
|
|
private int mCurrentILOffset;
|
|
public Unbox(ILReader aReader, MethodInformation aMethodInfo)
|
|
: base(aReader, aMethodInfo) {
|
|
mType = aReader.OperandValueType;
|
|
if (mType == null) {
|
|
throw new Exception("Unable to determine Type!");
|
|
}
|
|
mTypeSize = Engine.GetFieldStorageSize(mType);
|
|
mTypeId = Engine.RegisterType(mType);
|
|
mThisLabel = GetInstructionLabel(aReader);
|
|
mNextOpLabel = GetInstructionLabel(aReader.NextPosition);
|
|
mCurrentILOffset = aReader.Position;
|
|
}
|
|
public override void DoAssemble() {
|
|
string mReturnNullLabel = mThisLabel + "_ReturnNull";
|
|
new CPUx86.Move(CPUx86.Registers.EAX, CPUx86.Registers.AtESP);
|
|
new CPUx86.Compare(CPUx86.Registers.EAX, "0");
|
|
new CPUx86.JumpIfZero(mReturnNullLabel);
|
|
new CPUx86.Pushd(CPUx86.Registers.AtEAX);
|
|
Assembler.StackContents.Push(new StackContent(4, typeof(uint)));
|
|
new CPUx86.Pushd("0" + mTypeId + "h");
|
|
Assembler.StackContents.Push(new StackContent(4, typeof(uint)));
|
|
MethodBase xMethodIsInstance = Engine.GetMethodBase(Engine.GetType("", "Indy.IL2CPU.VTablesImpl"), "IsInstance", "System.Int32", "System.Int32");
|
|
Engine.QueueMethod(xMethodIsInstance);
|
|
Op xOp = new Call(xMethodIsInstance, mCurrentILOffset);
|
|
xOp.Assembler = Assembler;
|
|
xOp.Assemble();
|
|
new CPUx86.Pop(CPUx86.Registers.EAX);
|
|
Assembler.StackContents.Pop();
|
|
new CPUx86.Compare(CPUx86.Registers.EAX, "0");
|
|
new CPUx86.JumpIfEquals(mReturnNullLabel);
|
|
new CPUx86.Pop(CPUx86.Registers.EAX);
|
|
int xSize = mTypeSize;
|
|
if (xSize % 4 > 0) {
|
|
xSize += 4 - (xSize % 4);
|
|
}
|
|
int xItems = xSize /4;
|
|
for (int i = xItems - 1; i >= 0; i--) {
|
|
new CPUx86.Pushd("[eax + " + ((i * 4) + ObjectImpl.FieldDataOffset) + "]");
|
|
}
|
|
Assembler.StackContents.Push(new StackContent(mTypeSize, mType));
|
|
new CPUx86.JumpAlways(mNextOpLabel);
|
|
new CPU.Label(mReturnNullLabel);
|
|
new CPUx86.Add(CPUx86.Registers.ESP, "4");
|
|
new CPUx86.Pushd("0");
|
|
Assembler.StackContents.Push(new StackContent(4, typeof(object)));
|
|
}
|
|
}
|
|
} |