/// <summary> /// Pops the value on the stack, converts it to an integer, then pushes the integer result /// onto the stack. /// </summary> /// <param name="generator"> The IL generator. </param> /// <param name="fromType"> The type to convert from. </param> public static void ToInteger(ILGenerator generator, PrimitiveType fromType) { // Check that a conversion is actually necessary. if (fromType == PrimitiveType.Int32 || fromType == PrimitiveType.UInt32 || fromType == PrimitiveType.Bool) { return; } switch (fromType) { case PrimitiveType.Undefined: case PrimitiveType.Null: // Converting from undefined or null produces 0. generator.Pop(); generator.LoadInt32(0); break; case PrimitiveType.Number: // Converting from a number produces the following: // Any number between -2147483648 and +2147483647 -> itself // Any number smaller than -2147483648 -> -2147483648 // Any number larger than +2147483647 -> +2147483647 // NaN -> 0 // bool isPositiveInfinity = input > 2147483647.0 var isPositiveInfinity = generator.CreateTemporaryVariable(typeof(bool)); generator.Duplicate(); generator.LoadDouble(2147483647.0); generator.CompareGreaterThan(); generator.StoreVariable(isPositiveInfinity); // bool notNaN = input == input var notNaN = generator.CreateTemporaryVariable(typeof(bool)); generator.Duplicate(); generator.Duplicate(); generator.CompareEqual(); generator.StoreVariable(notNaN); // input = (int)input // Infinity -> -2147483648 // -Infinity -> -2147483648 // NaN -> -2147483648 generator.ConvertToInteger(); // input = input & -((int)notNaN) generator.LoadVariable(notNaN); generator.Negate(); generator.BitwiseAnd(); // input = input - (int)isPositiveInfinity generator.LoadVariable(isPositiveInfinity); generator.Subtract(); // The temporary variables are no longer needed. generator.ReleaseTemporaryVariable(notNaN); generator.ReleaseTemporaryVariable(isPositiveInfinity); break; case PrimitiveType.String: case PrimitiveType.ConcatenatedString: case PrimitiveType.Any: case PrimitiveType.Object: // Otherwise, fall back to calling TypeConverter.ToInteger() generator.Call(ReflectionHelpers.TypeConverter_ToInteger); break; default: throw new NotImplementedException(string.Format("Unsupported primitive type: {0}", fromType)); } }
/// <summary> /// Pops the value on the stack, converts it to an integer, then pushes the integer result /// onto the stack. /// </summary> /// <param name="generator"> The IL generator. </param> /// <param name="fromType"> The type to convert from. </param> public static void ToInteger(ILGenerator generator, PrimitiveType fromType) { // Check that a conversion is actually necessary. if (fromType == PrimitiveType.Int32 || fromType == PrimitiveType.UInt32 || fromType == PrimitiveType.Bool) return; switch (fromType) { case PrimitiveType.Undefined: case PrimitiveType.Null: // Converting from undefined or null produces 0. generator.Pop(); generator.LoadInt32(0); break; case PrimitiveType.Number: // Converting from a number produces the following: // Any number between -2147483648 and +2147483647 -> itself // Any number smaller than -2147483648 -> -2147483648 // Any number larger than +2147483647 -> +2147483647 // NaN -> 0 // bool isPositiveInfinity = input > 2147483647.0 var isPositiveInfinity = generator.CreateTemporaryVariable(typeof(bool)); generator.Duplicate(); generator.LoadDouble(2147483647.0); generator.CompareGreaterThan(); generator.StoreVariable(isPositiveInfinity); // bool notNaN = input == input var notNaN = generator.CreateTemporaryVariable(typeof(bool)); generator.Duplicate(); generator.Duplicate(); generator.CompareEqual(); generator.StoreVariable(notNaN); // input = (int)input // Infinity -> -2147483648 // -Infinity -> -2147483648 // NaN -> -2147483648 generator.ConvertToInteger(); // input = input & -((int)notNaN) generator.LoadVariable(notNaN); generator.Negate(); generator.BitwiseAnd(); // input = input - (int)isPositiveInfinity generator.LoadVariable(isPositiveInfinity); generator.Subtract(); // The temporary variables are no longer needed. generator.ReleaseTemporaryVariable(notNaN); generator.ReleaseTemporaryVariable(isPositiveInfinity); break; case PrimitiveType.String: case PrimitiveType.ConcatenatedString: case PrimitiveType.Any: case PrimitiveType.Object: // Otherwise, fall back to calling TypeConverter.ToInteger() generator.Call(ReflectionHelpers.TypeConverter_ToInteger); break; default: throw new NotImplementedException(string.Format("Unsupported primitive type: {0}", fromType)); } }