CompileTime.cs

using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEditor.Compilation;
using UnityEngine;

public class CompileTime
{
    private const string RELOAD_TIME_KEY = "AssemblyReloadEventsTime";
    private const string COMPILATION_TIME_KEY = "CompileStartTime";

    private static Dictionary<string, DateTime> s_compilationStartTimes = new Dictionary<string, DateTime>();

    [MenuItem("Tools/List Player Assemblies")]
    public static void PrintPlayerAssemblyNames()
    {
        PrintAssemblyNames(AssembliesType.Player);
    }

    [MenuItem("Tools/List Editor Assemblies")]
    public static void PrintEditorAssemblyNames()
    {
        PrintAssemblyNames(AssembliesType.Editor);
    }

    private static void PrintAssemblyNames(AssembliesType type)
    {
        Debug.Log($"== {type} Assemblies ==");
        Assembly[] playerAssemblies = CompilationPipeline.GetAssemblies(type);

        foreach (var assembly in playerAssemblies)
        {
            Debug.Log(assembly.name);
        }
    }

    [InitializeOnLoadMethod]
    private static void Init()
    {
        CompilationPipeline.assemblyCompilationStarted += CompilationPipelineOnAssemblyCompilationStarted;
        CompilationPipeline.assemblyCompilationFinished += CompilationPipelineOnAssemblyCompilationFinished;
#if UNITY_2019_1_OR_NEWER
        CompilationPipeline.compilationStarted += CompilationStarted;
        CompilationPipeline.compilationFinished += CompilationFinished;
#endif
        AssemblyReloadEvents.beforeAssemblyReload += OnBeforeReload;
        AssemblyReloadEvents.afterAssemblyReload += OnAfterReload;
    }

    private static void CompilationPipelineOnAssemblyCompilationStarted(string s)
    {
        s_compilationStartTimes[s] = DateTime.UtcNow;
        EditorPrefs.SetString($"CompileStartTime{s}", Convert.ToString(DateTime.UtcNow.Ticks));
    }

    private static void CompilationPipelineOnAssemblyCompilationFinished(string s, CompilerMessage[] compilerMessages)
    {
        var startTimeInTicks = EditorPrefs.GetString($"CompileStartTime{s}");
        var startTime = new DateTime(Convert.ToInt64(startTimeInTicks));

        var compileTime = DateTime.UtcNow - s_compilationStartTimes[s];

        Debug.Log($"Compilation Finished {s} ({compileTime.ToString("s\\.fff")}s)");
    }

    private static void CompilationStarted(object obj)
    {
        EditorPrefs.SetString(COMPILATION_TIME_KEY, Convert.ToString(DateTime.Now.Ticks));
    }

    private static void CompilationFinished(object obj)
    {
        var startTimeInTicks = EditorPrefs.GetString(COMPILATION_TIME_KEY);
        var startTime = new DateTime(Convert.ToInt64(startTimeInTicks));
        var compileTime = DateTime.Now - startTime;

        Debug.Log($"CompilationPipeline Compilation Finished ({compileTime.ToString("s\\.fff")}s)");
    }

    private static void OnBeforeReload()
    {
        EditorPrefs.SetString(RELOAD_TIME_KEY, DateTime.UtcNow.ToBinary().ToString());
    }

    private static void OnAfterReload()
    {
        var dateBinStr = EditorPrefs.GetString(RELOAD_TIME_KEY);
        long dateBin = 0;

        if (long.TryParse(dateBinStr, out dateBin))
        {
            var date = DateTime.FromBinary(dateBin);
            var timeSpan = DateTime.UtcNow - date;
            UnityEngine.Debug.LogFormat("Reload assemblies: {0:0.00}s", (float)timeSpan.TotalMilliseconds / 1000f);
        }

        EditorPrefs.DeleteKey(RELOAD_TIME_KEY);
    }
}