81 lines
2.2 KiB
C#
81 lines
2.2 KiB
C#
using System.Reflection.Emit;
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using System.Runtime.InteropServices;
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namespace ChocolArm64.Translation
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{
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class AILOpCodeConst : IAILEmit
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{
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[StructLayout(LayoutKind.Explicit, Size = 8)]
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private struct ImmVal
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{
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[FieldOffset(0)] public int I4;
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[FieldOffset(0)] public long I8;
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[FieldOffset(0)] public float R4;
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[FieldOffset(0)] public double R8;
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}
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private ImmVal Value;
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private enum ConstType
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{
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Int32,
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Int64,
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Single,
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Double
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}
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private ConstType Type;
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private AILOpCodeConst(ConstType Type)
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{
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this.Type = Type;
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}
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public AILOpCodeConst(int Value) : this(ConstType.Int32)
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{
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this.Value = new ImmVal { I4 = Value };
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}
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public AILOpCodeConst(long Value) : this(ConstType.Int64)
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{
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this.Value = new ImmVal { I8 = Value };
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}
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public AILOpCodeConst(float Value) : this(ConstType.Single)
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{
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this.Value = new ImmVal { R4 = Value };
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}
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public AILOpCodeConst(double Value) : this(ConstType.Double)
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{
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this.Value = new ImmVal { R8 = Value };
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}
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public void Emit(AILEmitter Context)
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{
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switch (Type)
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{
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case ConstType.Int32: Context.Generator.EmitLdc_I4(Value.I4); break;
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case ConstType.Int64:
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{
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if (Value.I8 >= int.MinValue &&
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Value.I8 <= int.MaxValue)
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{
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Context.Generator.EmitLdc_I4(Value.I4);
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Context.Generator.Emit(OpCodes.Conv_I8);
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}
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else
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{
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Context.Generator.Emit(OpCodes.Ldc_I8, Value.I8);
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}
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break;
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}
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case ConstType.Single: Context.Generator.Emit(OpCodes.Ldc_R4, Value.R4); break;
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case ConstType.Double: Context.Generator.Emit(OpCodes.Ldc_R8, Value.R8); break;
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}
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}
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}
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} |