Add support for .NET 8 Math functions (#3556)

Author: hazzik

src/NHibernate/Linq/Functions/MathGenerator.cs

@@ -80,16 +80,52 @@ public MathGenerator()
 				ReflectHelper.FastGetMethod(MathF.Ceiling, default(float)),
 
 				ReflectHelper.FastGetMethod(MathF.Pow, default(float), default(float)),
+#endif
+#if NET8_0_OR_GREATER
+				ReflectHelper.FastGetMethod(float.Sin, default(float)),
+				ReflectHelper.FastGetMethod(float.Cos, default(float)),
+				ReflectHelper.FastGetMethod(float.Tan, default(float)),
+				ReflectHelper.FastGetMethod(float.Sinh, default(float)),
+				ReflectHelper.FastGetMethod(float.Cosh, default(float)),
+				ReflectHelper.FastGetMethod(float.Tanh, default(float)),
+				ReflectHelper.FastGetMethod(float.Asin, default(float)),
+				ReflectHelper.FastGetMethod(float.Acos, default(float)),
+				ReflectHelper.FastGetMethod(float.Atan, default(float)),
+				ReflectHelper.FastGetMethod(float.Atan2, default(float), default(float)),
+				ReflectHelper.FastGetMethod(float.Sqrt, default(float)),
+				ReflectHelper.FastGetMethod(float.Abs, default(float)),
+				ReflectHelper.FastGetMethod(float.Sign, default(float)),
+				ReflectHelper.FastGetMethod(float.Floor, default(float)),
+				ReflectHelper.FastGetMethod(float.Ceiling, default(float)),
+				ReflectHelper.FastGetMethod(float.Pow, default(float), default(float)),
+				
+				ReflectHelper.FastGetMethod(double.Sin, default(double)),
+				ReflectHelper.FastGetMethod(double.Cos, default(double)),
+				ReflectHelper.FastGetMethod(double.Tan, default(double)),
+				ReflectHelper.FastGetMethod(double.Sinh, default(double)),
+				ReflectHelper.FastGetMethod(double.Cosh, default(double)),
+				ReflectHelper.FastGetMethod(double.Tanh, default(double)),
+				ReflectHelper.FastGetMethod(double.Asin, default(double)),
+				ReflectHelper.FastGetMethod(double.Acos, default(double)),
+				ReflectHelper.FastGetMethod(double.Atan, default(double)),
+				ReflectHelper.FastGetMethod(double.Atan2, default(double), default(double)),
+				ReflectHelper.FastGetMethod(double.Sqrt, default(double)),
+				ReflectHelper.FastGetMethod(double.Abs, default(double)),
+				ReflectHelper.FastGetMethod(double.Sign, default(double)),
+				ReflectHelper.FastGetMethod(double.Floor, default(double)),
+				ReflectHelper.FastGetMethod(double.Ceiling, default(double)),
+				ReflectHelper.FastGetMethod(double.Pow, default(double), default(double)),
 #endif
 			};
 		}
 
 		public override HqlTreeNode BuildHql(MethodInfo method, Expression expression, ReadOnlyCollection<Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
 		{
-			string function = method.Name.ToLowerInvariant();
-
-			if (function == "pow")
-				function = "power";
+			var function = method.Name.ToLowerInvariant() switch
+			{
+				"pow" => "power",
+				var f => f,
+			};
 
 			var firstArgument = visitor.Visit(arguments[0]).AsExpression();
 

src/NHibernate/Linq/Functions/RoundGenerator.cs

@@ -25,6 +25,13 @@ public RoundGenerator()
 				ReflectHelper.FastGetMethod(MathF.Round, default(float)),
 				ReflectHelper.FastGetMethod(MathF.Round, default(float), default(int)),
 #endif
+
+#if NET8_0_OR_GREATER
+				ReflectHelper.FastGetMethod(float.Round, default(float)),
+				ReflectHelper.FastGetMethod(float.Round, default(float), default(int)),
+				ReflectHelper.FastGetMethod(double.Round, default(double)),
+				ReflectHelper.FastGetMethod(double.Round, default(double), default(int)),
+#endif
 			};
 		}
 

src/NHibernate/Linq/Functions/TruncateGenerator.cs

@@ -20,6 +20,10 @@ public TruncateGenerator()
 
 #if NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
 				ReflectHelper.FastGetMethod(MathF.Truncate, default(float)),
+#endif
+#if NET8_0_OR_GREATER
+				ReflectHelper.FastGetMethod(float.Truncate, default(float)),
+				ReflectHelper.FastGetMethod(double.Truncate, default(double)),
 #endif
 			};
 		}