mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-22 22:09:12 +00:00
51 lines
No EOL
1.8 KiB
C#
51 lines
No EOL
1.8 KiB
C#
using System;
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using System.IO;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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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(Code.Castclass, false)]
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public class Castclass: Op {
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private int mTypeId;
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private string mThisLabel;
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private string mNextOpLabel;
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public Castclass(Mono.Cecil.Cil.Instruction aInstruction, MethodInformation aMethodInfo)
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: base(aInstruction, aMethodInfo) {
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TypeReference xType = aInstruction.Operand as TypeReference;
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if(xType==null) {
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throw new Exception("Unable to determine Type!");
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}
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TypeDefinition xTypeDef = Engine.GetDefinitionFromTypeReference(xType);
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mTypeId = Engine.RegisterType(xTypeDef);
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mThisLabel = GetInstructionLabel(aInstruction);
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mNextOpLabel = GetInstructionLabel(aInstruction.Next);
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}
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public override void DoAssemble() {
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// todo: throw an exception when the class does not support the cast!
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string mReturnNullLabel = mThisLabel + "_ReturnNull";
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Pop("eax");
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Assembler.StackSizes.Pop();
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Compare("eax", "0");
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JumpIfZero(mReturnNullLabel);
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Pushd(4, "[eax]");
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Pushd(4, "0" + mTypeId + "h");
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MethodDefinition xMethodIsInstance = Engine.GetMethodDefinition(Engine.GetTypeDefinition("", "Indy.IL2CPU.VTablesImpl"), "IsInstance", "System.Int32", "System.Int32");
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Engine.QueueMethod(xMethodIsInstance);
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Op xOp = new Call(xMethodIsInstance);
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xOp.Assembler = Assembler;
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xOp.Assemble();
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Pop("eax");
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Assembler.StackSizes.Pop();
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Compare("eax", "0");
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JumpIfEquals(mReturnNullLabel);
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Assembler.Add(new CPUx86.Pushd("eax"));
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JumpAlways(mNextOpLabel);
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Label(mReturnNullLabel);
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Assembler.Add(new CPUx86.Pushd("0"));
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Assembler.StackSizes.Push(4);
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}
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}
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} |