feat: Add Constant Conversion Helpers

Source/Silverfly.Backend/AstNodeExtensions.cs

@@ -0,0 +1,48 @@
+using System;
+using DistIL.IR;
+using Silverfly.Nodes;
+
+namespace Silverfly.Backend;
+
+public static class AstNodeExtensions
+{
+    public static Value? ToConstant(this AstNode astNode)
+    {
+        if (astNode is LiteralNode literalNode)
+        {
+            return literalNode.Value switch
+            {
+                bool b => ConstInt.CreateI(b ? 1 : 0),
+                char ch => ConstInt.CreateI(ch),
+                byte b => ConstInt.CreateI(b),
+                short s => ConstInt.CreateI(s),
+                int i => ConstInt.CreateI(i),
+                long l => ConstInt.CreateL(l),
+
+                sbyte sb => ConstInt.CreateI(sb),
+                ushort us => ConstInt.CreateI(us),
+
+                float f => ConstFloat.CreateS(f),
+                double d => ConstFloat.CreateD(d),
+
+                string s => ConstString.Create(s),
+
+                null => ConstNull.Create(),
+                _ => throw new ArgumentOutOfRangeException()
+            };
+        }
+
+        return null;
+    }
+
+
+    public static BinaryOp MapBinOperator(string op) =>
+        op switch
+        {
+            "+" => BinaryOp.Add,
+            "-" => BinaryOp.Sub,
+            "*" => BinaryOp.Mul,
+            "/" => BinaryOp.FDiv,
+            _ => throw new ArgumentOutOfRangeException(nameof(op), op, null)
+        };
+}

Source/Silverfly.Backend/Silverfly.Backend.csproj

@@ -12,6 +12,7 @@
     <TargetFramework>net8.0</TargetFramework>
     <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
     <IsTrimmable>true</IsTrimmable>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
     <ItemGroup>