Add more constructors in LocalRef and GlobalRef to accommodate use cases
where a JNIEnv is already available for performance reasons. Also add
more null-checks when creating references for performance reasons.
clang doesn't like it when we declare things as a struct in one place
and a class in another. This change makes all the current usages
consistent and clang happy.
This patch adds:
* Conversion operator from String::Param to String::LocalRef.
* More overloads of the jni::ThrowException function.
* name members to built-in types like jni::Object, jni::String, etc.
This allows using jni::Accessors::EnsureClassRef on built-in types
to get built-in class refs (e.g. jclass for java/lang/String).
* Ability to implicitly convert LocalRef<Cls> to LocalRef<Object>
* Fixes for bugs in LocalRef/GlobalRef where new refs are not created.
* Fixes for inaccurate uses of mozilla::Forward in favor of mozilla::Move
We use Ref::From() inside TypeAdapter<Ref>::ToNative to convert a raw JNI
ref argument to a Ref argument for the C++ function. However, that
generates a compile error, unless we make TypeAdapter<Ref> a friend of
Ref, because we intentionally made Ref's copy constructor private and
returning from TypeAdapter<Ref>::ToNative requires the copy constructor.
