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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using Microsoft.ClearScript.Util;
using Microsoft.ClearScript.V8.SplitProxy;
namespace Microsoft.ClearScript.V8
{
internal abstract partial class V8Proxy : IDisposable
{
//private static readonly object dataLock = new object();
//private static IntPtr hNativeAssembly;
//private static ulong splitImplCount;
//internal static bool OnEntityHolderCreated()
//{
// lock (dataLock)
// {
// if (hNativeAssembly == IntPtr.Zero)
// {
// hNativeAssembly = LoadNativeAssembly();
// InitializeICU();
// }
// ++splitImplCount;
// return true;
// }
//}
//internal static void OnEntityHolderDestroyed()
//{
// lock (dataLock)
// {
// if (--splitImplCount < 1)
// {
// FreeLibrary(hNativeAssembly);
// hNativeAssembly = IntPtr.Zero;
// }
// }
//}
//private static IntPtr LoadNativeAssembly()
//{
// string platform;
// string architecture;
// string extension;
// if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
// {
// platform = "win";
// extension = "dll";
// }
// else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
// {
// platform = "linux";
// extension = "so";
// }
// else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
// {
// platform = "osx";
// extension = "dylib";
// }
// else
// {
// throw new PlatformNotSupportedException("Unsupported OS platform");
// }
// if (RuntimeInformation.ProcessArchitecture == Architecture.X64)
// {
// architecture = "x64";
// }
// else if (RuntimeInformation.ProcessArchitecture == Architecture.X86)
// {
// architecture = "x86";
// }
// else if (RuntimeInformation.ProcessArchitecture == Architecture.Arm)
// {
// architecture = "arm";
// }
// else if (RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
// {
// architecture = "arm64";
// }
// else
// {
// throw new PlatformNotSupportedException("Unsupported process architecture");
// }
// return LoadNativeLibrary("ClearScriptV8", platform, architecture, extension);
//}
//private static IntPtr LoadNativeLibrary(string baseName, string platform, string architecture, string extension)
//{
// var fileName = $"{baseName}.{platform}-{architecture}.{extension}";
// IntPtr hLibrary;
// var messageBuilder = new StringBuilder();
// var paths = GetDirPaths(platform, architecture).Select(dirPath => Path.Combine(dirPath, deploymentDirName, fileName)).Distinct();
// foreach (var path in paths)
// {
// hLibrary = LoadLibrary(path);
// if (hLibrary != IntPtr.Zero)
// {
// return hLibrary;
// }
// messageBuilder.AppendInvariant("\n{0}: {1}", path, MiscHelpers.EnsureNonBlank(GetLoadLibraryErrorMessage(), "Unknown error"));
// }
// if (string.IsNullOrEmpty(deploymentDirName))
// {
// var systemPath = Path.Combine(Environment.SystemDirectory, fileName);
// hLibrary = LoadLibrary(systemPath);
// if (hLibrary != IntPtr.Zero)
// {
// return hLibrary;
// }
// messageBuilder.AppendInvariant("\n{0}: {1}", systemPath, MiscHelpers.EnsureNonBlank(GetLoadLibraryErrorMessage(), "Unknown error"));
// }
// var message = MiscHelpers.FormatInvariant("Cannot load ClearScript V8 library. Load failure information for {0}:{1}", fileName, messageBuilder);
// throw new TypeLoadException(message);
//}
//private static void InitializeICU()
//{
// var paths = GetDirPaths(null, null).Select(dirPath => Path.Combine(dirPath, deploymentDirName, "ClearScriptV8.ICU.dat")).Distinct();
// foreach (var path in paths)
// {
// if (File.Exists(path))
// {
// V8SplitProxyNative.InvokeNoThrow(instance => instance.V8Environment_InitializeICU(path));
// return;
// }
// }
//}
//private static IEnumerable<string> GetDirPaths(string platform, string architecture)
//{
// // The assembly location may be empty if the host preloaded the assembly
// // from custom storage. Support for this scenario was requested on CodePlex.
// var location = typeof(V8Proxy).Assembly.Location;
// if (!string.IsNullOrWhiteSpace(location))
// {
// if ((platform != null) && (architecture != null))
// {
// yield return Path.Combine(Path.GetDirectoryName(location), "runtimes", $"{platform}-{architecture}", "native");
// }
// yield return Path.GetDirectoryName(location);
// }
// var appDomain = AppDomain.CurrentDomain;
// yield return appDomain.BaseDirectory;
// var searchPath = appDomain.RelativeSearchPath;
// if (!string.IsNullOrWhiteSpace(searchPath))
// {
// foreach (var dirPath in searchPath.SplitSearchPath())
// {
// yield return dirPath;
// }
// }
//}
#region IDisposable implementation (abstract)
public abstract void Dispose();
#endregion
#region unit test support
//private static string deploymentDirName = string.Empty;
//internal static void RunWithDeploymentDir(string name, Action action)
//{
// deploymentDirName = name;
// try
// {
// action();
// }
// finally
// {
// deploymentDirName = string.Empty;
// }
//}
#endregion
}
}