* Create all INativeObject subclasses using 'Runtime.GetINativeObject<T>' instead
of 'new T ()'. Although it's somewhat slower, it automatically handles any IntPtr.Zero
handles, and it also makes the generator code simpler. If something turns out to
be a performance problem, we can always add custom static creation methods (like
some of the existing types already have).
* This makes it so that the zero pointer check logic in the generator isn't necessary
anymore.
* The most important part is where we use IntPtr as the marshalling type for returned
INativeObjects in blocks (instead of the INativeObject class - which doesn't make
sense really, because I have no idea how that's marshalled).
Example:
```diff
diff --git a/build/dotnet/ios/generated-sources/ObjCRuntime/Trampolines.g.cs b/build-new/dotnet/ios/generated-sources/ObjCRuntime/Trampolines.g.cs
index 97e58f3a91b..8a40748de8b 100644
--- a/build/dotnet/ios/generated-sources/ObjCRuntime/Trampolines.g.cs
+++ b/build-new/dotnet/ios/generated-sources/ObjCRuntime/Trampolines.g.cs
@@ -214,7 +214,7 @@ namespace ObjCRuntime {
} /* class NIDAVAudioEngineManualRenderingBlock */
[UnmanagedFunctionPointerAttribute (CallingConvention.Cdecl)]
[UserDelegateType (typeof (global::AVFoundation.AVAudioIONodeInputBlock))]
- internal delegate global::AudioToolbox.AudioBuffers DAVAudioIONodeInputBlock (IntPtr block, uint frameCount);
+ internal delegate IntPtr DAVAudioIONodeInputBlock (IntPtr block, uint frameCount);
//
// This class bridges native block invocations that call into C#
//
@@ -223,11 +223,11 @@ namespace ObjCRuntime {
[Preserve (Conditional = true)]
[global::System.Diagnostics.CodeAnalysis.DynamicDependency ("Handler")]
[MonoPInvokeCallback (typeof (DAVAudioIONodeInputBlock))]
- static unsafe global::AudioToolbox.AudioBuffers Invoke (IntPtr block, uint frameCount) {
+ static unsafe IntPtr Invoke (IntPtr block, uint frameCount) {
var descriptor = (BlockLiteral *) block;
var del = (global::AVFoundation.AVAudioIONodeInputBlock) (descriptor->Target);
AudioToolbox.AudioBuffers retval = del (frameCount);
- return retval;
+ return retval.GetHandle ();
}
} /* class SDAVAudioIONodeInputBlock */
internal sealed class NIDAVAudioIONodeInputBlock : TrampolineBlockBase {
@@ -249,7 +249,7 @@ namespace ObjCRuntime {
[BindingImpl (BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
unsafe global::AudioToolbox.AudioBuffers Invoke (uint frameCount)
{
- var ret = invoker (BlockPointer, frameCount);
+ var ret = Runtime.GetINativeObject<global::AudioToolbox.AudioBuffers> (invoker (BlockPointer, frameCount), false);
return ret!;
}
} /* class NIDAVAudioIONodeInputBlock */
```
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