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Support default interface methods #1883
Description
It's been known that C# 8.0 will support default interface methods (DIM) and we will have to wait for 8.0. Turned out that there is already a preview version built within mono sdks, named as csc-dim.
We should make use of it and implement preview support for DIMs that will make Java bindings easier.
So far I observed they exist in xamarin-android built tree as:
/sources/xamarin-android$ find . -name csc-dim*
./external/mono/scripts/csc-dim.in
./external/mono/sdks/builds/android-armeabi-v7a-debug/scripts/csc-dim
./external/mono/sdks/builds/android-x86-debug/scripts/csc-dim
./external/mono/sdks/builds/android-host-Linux-debug/scripts/csc-dim
/sources/xamarin-android$ cat ./external/mono/sdks/builds/android-host-Linux-debug/scripts/csc-dim
#!/bin/sh
exec /sources/xamarin-android/external/mono/sdks/out/android-host-Linux-debug/bin/mono --gc-params=nursery-size=64m $MONO_OPTIONS /sources/xamarin-android/external/mono/sdks/out/android-host-Linux-debug/lib/mono/4.5/dim/csc.exe "$@"
Activity
atsushieno commentedon Jun 26, 2018
Marek Safar said we should use csc-dim from system mono instead (after I noticed there is actually no
/sources/xamarin-android/external/mono/sdks/out/android-host-Linux-debug/lib/mono/4.5/dim/csc.exe). What we should do is probably an extension NuGet package that provides these "dim" assemblies and overrideCscToolPathMSBuild property. So far/p:CscToolExe=/path/to/my/lib/mono/4.5/dimmade it to work.jonpryor commentedon Jun 26, 2018
Step 1: update
generatorwithin Java.Interop to emit default interface methods.This need only support the
XAJavaInterop1andJavaInteropcodegen targets, not theXamarinAndroidcodegen target.jonpryor commentedon Jun 26, 2018
Existing on-desktop-JVM Java.Interop unit tests: https://github.com/xamarin/java.interop/tree/master/src/Java.Interop/Tests
https://github.com/xamarin/java.interop/blob/master/src/Java.Interop/Tests/Java.Interop/JavaObjectTest.cs
These build atop a
JavaVMFixture, which creates a desktop JVM: https://github.com/xamarin/java.interop/blob/master/tests/Java.Interop-Tests/Java.Interop/JavaVMFixture.cshttps://github.com/xamarin/java.interop/blob/master/tests/TestJVM/TestJVM.cs
It should be straightforward to add a new
generatorunit test fixture which usesTestJVM/etc. to create an on-desktop JVM and run tests usinggenerator-emitted code.jpobst commentedon Oct 1, 2019
Added in #3533.