tree e10b260bd97abc8d62513ecd9dc0763cf43d9dda
parent f8e15bda9eb0d3c0cf9fb9a8c1376abea3d17a7f
author Clement Skau <cskau@google.com> 1631710055 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1631710055 +0000

[vm/ffi] Adds FFI transform for Handle -> Pointer.

This will automatically desugar FfiNative calls passing
NativeFieldWrapperClass1 handles to use Pointer when
the underlying native function expects a pointer.
E.g.:

```
class ClassWithNativeField extends NativeFieldWrapperClass1 {}

@FfiNative<IntPtr Function(Pointer<Void>)>('PassAsPointer')
external int passAsPointer(ClassWithNativeField obj);

passAsPointer(ClassWithNativeField());
// Becomes roughly:
// #t0 = PointerClassWithNativeField();
// passAsPointer(Pointer.fromAddress(getNativeField(#t0)));
// reachabilityFence(#t0);
```

TEST=Adds new tests in tests/ffi/ffi_native_test.dart.
Change-Id: I4460f9249803054f12be5d5ff34dbdf7c96567fd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/213260
Commit-Queue: Clement Skau <cskau@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>