* Keep track of which parameters needs to be written back. This makes sure the
writeback loop doesn't run into non-writeback-parameters it doesn't know how
to handle (by skipping them completely).
* Keep track of the (post-marshal) input to the out/ref parameters, so that we
know whether we need to marshal anything back in the writeback loop.
* [runtime] Add an inner exception parameter to Runtime.CreateProductException.
This allows us to simplify code by using inner (and outer) exceptions as
a means to provide information instead of passing extra information
around in order to create decent exceptions.
One example is how we pass the selector and method name to the method
that converts from a native id to a managed NSObject instance: passing
this information is not necessary anymore if we can use two exceptions,
one for the failure to convert from an id to a NSObject instance,
wrapped in a second that tells which method/selector call ran into this
conversion problem.
* [runtime] Throw better exceptions when the dynamic registrar can't marshal something.
* [runtime] Throw a better exception when something goes wrong when trying to marshal a return value.
* [runtime] Use inner exceptions to convey failure information instead of trying to create a single exception with all we know.
* Fix merge problem.
* [Foundation] Add an NSArray.FromNSObjects overload that can take an array of INativeObjects.
* [runtime] Use mono_array_setref instead of mono_array_set.
Otherwise the GC won't know about the assignment, and the assigned value can
be freed if it's no longer referenced anywhere else.
* Convert it into a MM8027/MT8027 error (with documentation).
* Add information about the selector and managed method that triggered the error.
Now the problem reported in issue #4254 shows up as:
> ObjCRuntime.RuntimeException: Failed to marshal the Objective-C object 0x7f8080412810 (type: UIView). Could not find an existing managed instance for this object, nor was it possible to create a new managed instance (because the type 'UIKit.UIView&' does not have a constructor that takes one IntPtr argument).
> Additional information:
> Selector: popoverController:willRepositionPopoverToRect:inView:
> Method: UIKit.UIPopoverController+_UIPopoverControllerDelegate.WillReposition(UIKit.UIPopoverController, CoreGraphics.CGRect ByRef, UIKit.UIView ByRef)
instead of just:
> ObjCRuntime.RuntimeException: Failed to marshal the Objective-C object 0x7f8080412810 (type: UIView). Could not find an existing managed instance for this object, nor was it possible to create a new managed instance (because the type 'UIKit.UIView&' does not have a constructor that takes one IntPtr argument).
which makes it much easier to understand, track down, and fix/work around,
both for customers and ourselves.
* [static registrar] Optimize creation of delegates for blocks.
Optimize creation of delegates for blocks so that it doesn't require the
dynamic registrar.
This is done by getting the metadata token for the Create method that creates
the delegate, and embed that metadata token in the generated code from the
static registrar.
Also add tests, since this scenario was not covered by tests already.
* [mmptest] Fix test after recent changes.
* [test-libraries] Avoid duplicate symbols.
* [tests] Update according to changes.
Converting to and from smart enums and their corresponding native value
requires knowing the conversion function, since each smart enum has its own
conversion function.
The dynamic registrar can do this at runtime, but it's something that can be
computed in the static registrar at build time, so do that. The static
registrar will now embed the metadata token (as a token reference) in the
generated code, which can be used at runtime to find the conversion method,
without requiring anything from dynamic registrar.
This requires some refactoring in the conversion methods to allow passing more
information around (the `context` parameter in the conversion functions, which
the smart enum conversion methods now use for the token reference).
It turns out this is a massive improvement (although the scenarios where this
is relevant are rare): a simple test case [1] is 300x faster (from ~30s to
0.1s).
[1]: https://gist.github.com/rolfbjarne/961af28d1c2727b256fbcdfd6aa65e98
Two Objective-C methods can be named identically as long as one is static and
the other instance.
We must support this since Apple did just this (in the NSItemProviderReading /
NSItemProviderWriting protocols).
We solve it by prepending a '+' or '-' to the selector when hashing it (to
determine selector uniqueness, and to look the method up again at runtime).
[registrar] Support 'out' parameters from NULL pointers. Fixes#54919.
Native code doesn't have the 'out' and 'ref' distinction C# has, and passes
NULL around left and right.
So make sure the generated code from the static registrar doesn't write to such NULLs.
https://bugzilla.xamarin.com/show_bug.cgi?id=54919
This fixes an issue clang's static analyzer found: if an exception occured in
a call to managed code, we wouldn't process the list of objects to dispose:
trampolines-invoke.m:549:2: warning: Potential leak of memory pointed to by 'dispose_list'
MONO_THREAD_DETACH; // COOP: This will switch to GC_SAFE
^~~~~~~~~~~~~~~~~~
./xamarin/runtime.h:306:11: note: expanded from macro 'MONO_THREAD_DETACH'
} while (0)
^
Fix this by always processing the list of objects to dispose, even if
exceptions occur.
Managed exception marshaling interferes with the debugger, because it adds
exception handlers to executing code, which makes the Mono runtime think an
exception is handled when logically it's not (although technically it is).
The consequence is that the IDEs will only be notified when we re-throw the
exception after catching it, making it impossible for the IDEs to stop when
the exception is thrown (they will instead stop when we re-throw the
exception).
So disable managed exception marshaling (unless the user changed the default
behavior) when a debugger is attached.
This is the same behavior as Xamarin.Android.
https://bugzilla.xamarin.com/show_bug.cgi?id=45116
* [tests] Remove Classic SDK tests.
* Remove XI/Classic support.
This also means we can remove support for the legacy registrars.
* [monotouch-test] Remove legacy registrar tests.
* [tests/mtouch] Remove Classic tests (and legacy registrar logic).
* [tests/scripted] Fix tests to reference Xamarin.iOS.dll.
Support binding NSObjects as IntPtr. This is usually not
a problem, because when we fetch the ObjC signature for a
method, we usually get the signature as exported by us,
(in which case a parameter bound as 'IntPtr' would be treated
as 'void *' in the dynamic registrar) *except* when the
selector corresponds with a protocol the type implements,
in which case we get the signature as defined in the protocol.
https://bugzilla.xamarin.com/show_bug.cgi?id=41132
Rolf Bjarne Kvinge