commit 207c98ab02c7477d12953e946585b8df2597db60
author Steven Moreland <smoreland@google.com> Mon Aug 22 22:43:47 2022 +0000
committer Steven Moreland <smoreland@google.com> Wed Aug 24 23:00:27 2022 +0000
tree 802d30f628f5688af1eb13a1a68a38d72ff9fa42
parent 2eb58bc2a848cc483badadda5ae08f3a18d72094

Custom NDK Parcelables

Define custom parcelables for use with
aidl_interface. This was previously left out of the
design intentionally in order to discourage manual
parcelables (both because they were unsafe and also
because later, we realized they would also limit
our ability to use RPC binder).

Now! In the throes of progress we abandon our
idealist dreams for unrestrained orthogonality. In this
spirit, arbitrary shared lib dependencies are allowed
to be added to aidl_interface. Be weary, travelers!

In order to use NDK parcelables with this:

1. declare the NDK parcelable with ndk_header.
   You must declare this separately from the
   aidl_interface and then either use imports or
   aidl_interface_headers. An unstructured parcelable
   still can't be used with aidl_interface srcs.
2. declare the NDK parcelable as
   @NdkOnlyStableParcelable. Note: this is for
   parity with Java. Also, in the future, it can
   be used to distinguish between NDK-provided
   parcelables and also stable parcelables of the
   NDK format which don't use this (e.g. those
   used in apps).
3. make sure your NDK parcelable implements the
   same interface as is expected by regular
   NDK-backend parcelables.

   class MyCustomParcelable {
       binder_status_t readFromParcel(const AParcel* parcel);
       binder_status_t writeToParcel(AParcel* parcel) const;
   }

Fixes: 242206118
Test: ran several locally, but FIXME: need to
  actually use this with an NDK parcelable.

Change-Id: Ib556416c095fa42ecd753cac93666518106814a8