109 lines
3.1 KiB
C#
109 lines
3.1 KiB
C#
using System;
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using System.Diagnostics;
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using System.Reflection.Emit;
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using Flee.InternalTypes;
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using Flee.PublicTypes;
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using Flee.Resources;
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namespace Flee.ExpressionElements.Base.Literals
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{
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internal abstract class LiteralElement : ExpressionElement
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{
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protected void OnParseOverflow(string image)
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{
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base.ThrowCompileException(CompileErrorResourceKeys.ValueNotRepresentableInType, CompileExceptionReason.ConstantOverflow, image, this.ResultType.Name);
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}
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public static void EmitLoad(Int32 value, FleeILGenerator ilg)
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{
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if (value >= -1 & value <= 8)
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{
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EmitSuperShort(value, ilg);
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}
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else if (value >= sbyte.MinValue & value <= sbyte.MaxValue)
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{
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ilg.Emit(OpCodes.Ldc_I4_S, Convert.ToSByte(value));
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}
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else
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{
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ilg.Emit(OpCodes.Ldc_I4, value);
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}
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}
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protected static void EmitLoad(Int64 value, FleeILGenerator ilg)
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{
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if (value >= Int32.MinValue & value <= Int32.MaxValue)
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{
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EmitLoad(Convert.ToInt32(value), ilg);
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ilg.Emit(OpCodes.Conv_I8);
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}
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else if (value >= 0 & value <= UInt32.MaxValue)
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{
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ilg.Emit(OpCodes.Ldc_I4, unchecked((int)Convert.ToUInt32(value)));
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ilg.Emit(OpCodes.Conv_U8);
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}
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else
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{
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ilg.Emit(OpCodes.Ldc_I8, value);
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}
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}
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protected static void EmitLoad(bool value, FleeILGenerator ilg)
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{
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if (value == true)
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{
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ilg.Emit(OpCodes.Ldc_I4_1);
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}
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else
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{
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ilg.Emit(OpCodes.Ldc_I4_0);
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}
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}
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private static void EmitSuperShort(Int32 value, FleeILGenerator ilg)
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{
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OpCode ldcOpcode = default(OpCode);
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switch (value)
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{
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case 0:
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ldcOpcode = OpCodes.Ldc_I4_0;
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break;
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case 1:
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ldcOpcode = OpCodes.Ldc_I4_1;
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break;
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case 2:
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ldcOpcode = OpCodes.Ldc_I4_2;
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break;
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case 3:
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ldcOpcode = OpCodes.Ldc_I4_3;
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break;
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case 4:
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ldcOpcode = OpCodes.Ldc_I4_4;
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break;
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case 5:
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ldcOpcode = OpCodes.Ldc_I4_5;
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break;
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case 6:
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ldcOpcode = OpCodes.Ldc_I4_6;
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break;
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case 7:
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ldcOpcode = OpCodes.Ldc_I4_7;
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break;
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case 8:
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ldcOpcode = OpCodes.Ldc_I4_8;
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break;
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case -1:
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ldcOpcode = OpCodes.Ldc_I4_M1;
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break;
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default:
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Debug.Assert(false, "value out of range");
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break;
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}
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ilg.Emit(ldcOpcode);
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}
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}
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}
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