MiniRuntime.cs

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namespace Internal.Runtime.CompilerHelpers
{
    // A class that the compiler looks for that has helpers to initialize the
    // process. The compiler can gracefully handle the helpers not being present,
    // but the class itself being absent is unhandled. Let's add an empty class.
    class StartupCodeHelpers
    {
        [System.Runtime.RuntimeExport("RhpReversePInvoke2")]
        static void RhpReversePInvoke2(System.IntPtr frame) { }
        [System.Runtime.RuntimeExport("RhpReversePInvokeReturn2")]
        static void RhpReversePInvokeReturn2(System.IntPtr frame) { }
        [System.Runtime.RuntimeExport("RhpPInvoke")]
        static void RhpPinvoke(System.IntPtr frame) { }
        [System.Runtime.RuntimeExport("RhpPInvokeReturn")]
        static void RhpPinvokeReturn(System.IntPtr frame) { }
    }
}

namespace System
{
    class Array<T> : Array { }
}

namespace System.Runtime
{
    // Custom attribute that the compiler understands that instructs it
    // to export the method under the given symbolic name.
    internal sealed class RuntimeExportAttribute : Attribute
    {
        public RuntimeExportAttribute(string entry) { }
    }
}

namespace System.Runtime.InteropServices
{
    public class UnmanagedType { }

    // Custom attribute that marks a class as having special "Call" intrinsics.
    internal class McgIntrinsicsAttribute : Attribute { }

    internal enum OSPlatform
    {
        Windows,
        Linux,
    }
}

namespace System.Runtime.CompilerServices
{
    // A class responsible for running static constructors. The compiler will call into this
    // code to ensure static constructors run and that they only run once.
    [System.Runtime.InteropServices.McgIntrinsics]
    internal static class ClassConstructorRunner
    {
        private static unsafe IntPtr CheckStaticClassConstructionReturnNonGCStaticBase(ref StaticClassConstructionContext context, IntPtr nonGcStaticBase)
        {
            CheckStaticClassConstruction(ref context);
            return nonGcStaticBase;
        }