add feature as a standalone optimizer

src/Neo.Compiler.CSharp/CompilationEngine/CompilationContext.cs

@@ -159,8 +159,7 @@ internal void Compile()
                 try
                 {
 #pragma warning disable CS8600 // Converting null literal or possible null value to non-nullable type.
-                    (nef, manifest, debugInfo) = Reachability.RemoveUncoveredInstructions(nef, manifest, debugInfo.Clone() as JObject);
-                    (nef, manifest, debugInfo) = Reachability.RemoveUnnecessaryJumps(nef, manifest, debugInfo!.Clone() as JObject);
+                    (nef, manifest, debugInfo) = Neo.Optimizer.Optimizer.Optimize(nef, manifest, debugInfo: debugInfo!, optimizationType: Options.Optimize);
 #pragma warning restore CS8600 // Converting null literal or possible null value to non-nullable type.
                 }
                 catch (Exception ex)

src/Neo.Compiler.CSharp/Optimizer/DumpNef.cs

@@ -17,8 +17,10 @@
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.IO;
+using System.IO.Compression;
 using System.Linq;
 using System.Numerics;
+using System.Text;
 using System.Text.RegularExpressions;
 
 namespace Neo.Optimizer
@@ -32,6 +34,41 @@ static class DumpNef
         static readonly Lazy<IReadOnlyDictionary<uint, string>> sysCallNames = new(
             () => ApplicationEngine.Services.ToImmutableDictionary(kvp => kvp.Value.Hash, kvp => kvp.Value.Name));
 
+        public static byte[] ZipDebugInfo(byte[] content, string innerFilename)
+        {
+            using (var compressedFileStream = new MemoryStream())
+            {
+                using (var zipArchive = new ZipArchive(compressedFileStream, ZipArchiveMode.Update, false))
+                {
+                    var zipEntry = zipArchive.CreateEntry(innerFilename);
+                    using (var originalFileStream = new MemoryStream(content))
+                    {
+                        using (var zipEntryStream = zipEntry.Open())
+                        {
+                            originalFileStream.CopyTo(zipEntryStream);
+                        }
+                    }
+                }
+                return compressedFileStream.ToArray();
+            }
+        }
+
+        public static string UnzipDebugInfo(byte[] zippedBuffer)
+        {
+            using var zippedStream = new MemoryStream(zippedBuffer);
+            using var archive = new ZipArchive(zippedStream, ZipArchiveMode.Read, false, Encoding.UTF8);
+            var entry = archive.Entries.FirstOrDefault();
+            if (entry != null)
+            {
+                using var unzippedEntryStream = entry.Open();
+                using var ms = new MemoryStream();
+                unzippedEntryStream.CopyTo(ms);
+                var unzippedArray = ms.ToArray();
+                return Encoding.UTF8.GetString(unzippedArray);
+            }
+            throw new ArgumentException("No file found in zip archive");
+        }
+
         public static string GetInstructionAddressPadding(this Script script)
         {
             var digitCount = EnumerateInstructions(script).Last().address switch

src/Neo.Compiler.CSharp/Optimizer/Strategies/Optimizer.cs

@@ -9,6 +9,7 @@
 // Redistribution and use in source and binary forms with or without
 // modifications are permitted.
 
+using Neo.Compiler;
 using Neo.Json;
 using Neo.SmartContract;
 using Neo.SmartContract.Manifest;
@@ -19,7 +20,7 @@
 
 namespace Neo.Optimizer
 {
-    class Optimizer
+    public static class Optimizer
     {
         public static readonly int[] OperandSizePrefixTable = new int[256];
         public static readonly int[] OperandSizeTable = new int[256];
@@ -50,5 +51,22 @@ public static void RegisterStrategies(Type type)
                 strategies[name] = method.CreateDelegate<Func<NefFile, ContractManifest, JObject, (NefFile nef, ContractManifest manifest, JObject debugInfo)>>();
             }
         }
+
+        public static (NefFile, ContractManifest, JObject?) Optimize(NefFile nef, ContractManifest manifest, JObject? debugInfo = null, CompilationOptions.OptimizationType optimizationType = CompilationOptions.OptimizationType.All)
+        {
+            // Define the optimization type inside the manifest
+            if (optimizationType != CompilationOptions.OptimizationType.None)
+            {
+                manifest.Extra ??= new JObject();
+                manifest.Extra["nef"] = new JObject();
+                manifest.Extra["nef"]!["optimization"] = optimizationType.ToString();
+            }
+            if (!optimizationType.HasFlag(CompilationOptions.OptimizationType.Experimental))
+                return (nef, manifest, debugInfo);  // do nothing
+            // TODO in the future: optimize by StrategyAttribute in a loop
+            (nef, manifest, debugInfo) = Reachability.RemoveUncoveredInstructions(nef, manifest, debugInfo?.Clone() as JObject);
+            (nef, manifest, debugInfo) = Reachability.RemoveUnnecessaryJumps(nef, manifest, debugInfo?.Clone() as JObject);
+            return (nef, manifest, debugInfo);
+        }
     }
 }

src/Neo.Compiler.CSharp/Program.cs

@@ -92,7 +92,41 @@ private static void Handle(RootCommand command, Options options, string[]? paths
             }
             foreach (string path in paths)
             {
-                if (Path.GetExtension(path).ToLowerInvariant() != ".cs")
+                string extension = Path.GetExtension(path).ToLowerInvariant();
+                if (extension == ".nef")
+                {
+                    string directory = Path.GetDirectoryName(path)!;
+                    string filename = Path.GetFileNameWithoutExtension(path)!;
+                    Console.WriteLine($"Optimizing {filename}.nef to {filename}.optimized.nef...");
+                    NefFile nef = NefFile.Parse(File.ReadAllBytes(path));
+                    string manifestPath = Path.Join(directory, filename + ".manifest.json");
+                    if (!File.Exists(manifestPath))
+                        throw new FileNotFoundException($"{filename}.manifest.json required for optimization");
+                    ContractManifest manifest = ContractManifest.Parse(File.ReadAllText(manifestPath));
+                    string debugInfoPath = Path.Join(directory, filename + ".nefdbgnfo");
+                    JObject? debugInfo;
+                    if (File.Exists(debugInfoPath))
+                        debugInfo = (JObject?)JObject.Parse(DumpNef.UnzipDebugInfo(File.ReadAllBytes(debugInfoPath)));
+                    else
+                        debugInfo = null;
+                    (nef, manifest, debugInfo) = Neo.Optimizer.Optimizer.Optimize(nef, manifest, debugInfo, optimizationType: CompilationOptions.OptimizationType.All);
+                    // Define the optimization type inside the manifest
+                    manifest.Extra ??= new JObject();
+                    manifest.Extra["nef"] = new JObject();
+                    manifest.Extra["nef"]!["optimization"] = CompilationOptions.OptimizationType.All.ToString();
+                    File.WriteAllBytes(Path.Combine(directory, filename + ".optimized.nef"), nef.ToArray());
+                    File.WriteAllBytes(Path.Combine(directory, filename + ".optimized.manifest.json"), manifest.ToJson().ToByteArray(true));
+                    if (options.Assembly)
+                    {
+                        string dumpnef = DumpNef.GenerateDumpNef(nef, debugInfo);
+                        File.WriteAllText(Path.Combine(directory, filename + ".optimized.nef.txt"), dumpnef);
+                    }
+                    if (debugInfo != null)
+                        File.WriteAllBytes(Path.Combine(directory, filename + ".optimized.nefdbgnfo"), DumpNef.ZipDebugInfo(debugInfo.ToByteArray(true), filename + ".optimized.debug.json"));
+                    Console.WriteLine($"Optimization finished.");
+                    return;
+                }
+                if (extension != ".cs")
                 {
                     Console.Error.WriteLine("The files must have a .cs extension.");
                     context.ExitCode = 1;