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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using Internal.TypeSystem;
using NumberStyles = System.Globalization.NumberStyles;
namespace Internal.JitInterface
{
public sealed class JitConfigProvider
{
// Jit configuration is static because RyuJIT doesn't support multiple hosts within the same process.
private static JitConfigProvider s_instance;
public static JitConfigProvider Instance
{
get
{
Debug.Assert(s_instance != null);
return s_instance;
}
}
private CorJitFlag[] _jitFlags;
private Dictionary<string, string> _config = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
public static void Initialize(
TargetDetails target,
IEnumerable<CorJitFlag> jitFlags,
IEnumerable<KeyValuePair<string, string>> parameters,
string jitPath = null)
{
var config = new JitConfigProvider(jitFlags, parameters);
// Make sure we didn't try to initialize two instances of JIT configuration.
// RyuJIT doesn't support multiple hosts in a single process.
if (Interlocked.CompareExchange(ref s_instance, config, null) != null)
throw new InvalidOperationException();
NativeLibrary.SetDllImportResolver(typeof(CorInfoImpl).Assembly, (libName, assembly, searchPath) =>
{
IntPtr libHandle = IntPtr.Zero;
if (libName == CorInfoImpl.JitLibrary)
{
if (!string.IsNullOrEmpty(jitPath))
{
libHandle = NativeLibrary.Load(jitPath);
}
else
{
libHandle = NativeLibrary.Load("clrjit_" + GetTargetSpec(target), assembly, searchPath);
}
}
if (libName == CorInfoImpl.JitSupportLibrary)
{
libHandle = NativeLibrary.Load("jitinterface_" + RuntimeInformation.ProcessArchitecture.ToString().ToLowerInvariant(), assembly, searchPath);
}
return libHandle;
});
CorInfoImpl.Startup(CorInfoImpl.TargetToOs(target));
}
public IntPtr UnmanagedInstance
{
get;
}
public IEnumerable<CorJitFlag> Flags => _jitFlags;
/// <summary>
/// Creates a new instance of <see cref="JitConfigProvider"/>.
/// </summary>
/// <param name="jitFlags">A collection of JIT compiler flags.</param>
/// <param name="parameters">A collection of parameter name/value pairs.</param>
public JitConfigProvider(IEnumerable<CorJitFlag> jitFlags, IEnumerable<KeyValuePair<string, string>> parameters)
{
ArrayBuilder<CorJitFlag> jitFlagBuilder = default(ArrayBuilder<CorJitFlag>);
foreach (CorJitFlag jitFlag in jitFlags)
{
jitFlagBuilder.Add(jitFlag);
}
_jitFlags = jitFlagBuilder.ToArray();
foreach (var param in parameters)
{
_config[param.Key] = param.Value;
}
UnmanagedInstance = CreateUnmanagedInstance();
}
public bool HasFlag(CorJitFlag flag)
{
foreach (CorJitFlag definedFlag in _jitFlags)
if (definedFlag == flag)
return true;
return false;
}
public int GetIntConfigValue(string name, int defaultValue)
{
// Note: Parse the string as hex
string stringValue;
int intValue;
if (_config.TryGetValue(name, out stringValue) &&
int.TryParse(stringValue, NumberStyles.AllowHexSpecifier, null, out intValue))
{
return intValue;
}
return defaultValue;
}
public string GetStringConfigValue(string name)
{
string stringValue;
if (_config.TryGetValue(name, out stringValue))
{
return stringValue;
}
return string.Empty;
}
private static string GetTargetSpec(TargetDetails target)
{
string targetOSComponent = (target.OperatingSystem == TargetOS.Windows ? "win" : "unix");
string targetArchComponent = target.Architecture switch
{
TargetArchitecture.X86 => "x86",
TargetArchitecture.X64 => "x64",
TargetArchitecture.ARM => "arm",
TargetArchitecture.ARM64 => "arm64",
TargetArchitecture.LoongArch64 => "loongarch64",
_ => throw new NotImplementedException(target.Architecture.ToString())
};
if ((target.Architecture == TargetArchitecture.ARM64) || (target.Architecture == TargetArchitecture.ARM))
{
targetOSComponent = "universal";
}
return targetOSComponent + '_' + targetArchComponent + "_" + RuntimeInformation.ProcessArchitecture.ToString().ToLowerInvariant();
}
#region Unmanaged instance
private static unsafe IntPtr CreateUnmanagedInstance()
{
// This potentially leaks memory, but since we only expect to have one per compilation,
// it shouldn't matter...
const int numCallbacks = 2;
void** callbacks = (void**)Marshal.AllocCoTaskMem(sizeof(IntPtr) * numCallbacks);
callbacks[0] = (delegate* unmanaged<IntPtr, char*, int, int>)&getIntConfigValue;
callbacks[1] = (delegate* unmanaged<IntPtr, char*, char*, int, int>)&getStringConfigValue;
IntPtr instance = Marshal.AllocCoTaskMem(sizeof(IntPtr));
*(IntPtr*)instance = (IntPtr)callbacks;
return instance;
}
[UnmanagedCallersOnly]
private static unsafe int getIntConfigValue(IntPtr thisHandle, char* name, int defaultValue)
{
return s_instance.GetIntConfigValue(new string(name), defaultValue);
}
[UnmanagedCallersOnly]
private static unsafe int getStringConfigValue(IntPtr thisHandle, char* name, char* retBuffer, int retBufferLength)
{
string result = s_instance.GetStringConfigValue(new string(name));
for (int i = 0; i < Math.Min(retBufferLength, result.Length); i++)
retBuffer[i] = result[i];
return result.Length;
}
#endregion
}
}
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