52 lines
1.2 KiB
C#
52 lines
1.2 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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namespace CPF.Mac.ObjCRuntime
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{
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public struct BlockLiteral
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{
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public IntPtr isa;
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public BlockFlags flags;
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public int reserved;
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public IntPtr invoke;
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public IntPtr block_descriptor;
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public IntPtr local_handle;
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public IntPtr global_handle;
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internal static IntPtr block_class;
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internal static BlockDescriptor global_descriptor;
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internal static IntPtr global_descriptor_ptr;
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static BlockLiteral()
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{
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block_class = Class.GetHandle("__NSStackBlock");
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global_descriptor = BlockDescriptor.CreateDescriptor();
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global_descriptor_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(IntPtr)) * 2 + Marshal.SizeOf(typeof(IntPtr)) * 2);
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Marshal.StructureToPtr(global_descriptor, global_descriptor_ptr, fDeleteOld: false);
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}
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public void SetupBlock(Delegate trampoline, Delegate userDelegate)
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{
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isa = block_class;
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invoke = Marshal.GetFunctionPointerForDelegate(trampoline);
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local_handle = (IntPtr)GCHandle.Alloc(userDelegate);
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global_handle = IntPtr.Zero;
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flags = (BlockFlags.BLOCK_HAS_COPY_DISPOSE | BlockFlags.BLOCK_HAS_DESCRIPTOR);
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block_descriptor = global_descriptor_ptr;
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}
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public void CleanupBlock()
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{
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GCHandle.FromIntPtr(local_handle).Free();
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}
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}
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}
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