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This CL introduces dart_api_dl.h which exposes a subset of dart_api.h and dart_native_api.h for dynamic linking at runtime through the FFI. Dynamic linking is done through including dart_api_dl.cc in a shared library and passing NativeApi.initializeApiDLData to the init function. This CL also includes Native API versioning to deal with possible version skew between native api version against which native libraries are compiled and the version in the DartVM the code is run on. The subset of symbols in the CL includes handle related symbols, error related symbols, handle scope symbols, and native port sumbols. Design: http://go/dart-ffi-expose-dart-api Closes: https://github.com/dart-lang/sdk/issues/40607 Closes: https://github.com/dart-lang/sdk/issues/36858 Closes: https://github.com/dart-lang/sdk/issues/41319 Closes: https://github.com/flutter/flutter/issues/46887 Closes: https://github.com/flutter/flutter/issues/47061 Misc: Closes: https://github.com/dart-lang/sdk/issues/42260 Change-Id: I9e557808dbc99b341f23964cbddbb05f26d7a6c5 Cq-Include-Trybots: luci.dart.try:vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64-try,app-kernel-linux-debug-x64-try,vm-kernel-linux-debug-ia32-try,vm-kernel-win-debug-x64-try,vm-kernel-win-debug-ia32-try,vm-kernel-precomp-linux-debug-x64-try,vm-dartkb-linux-release-x64-abi-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-asan-linux-release-x64-try,vm-kernel-msan-linux-release-x64-try,vm-kernel-precomp-msan-linux-release-x64-try,vm-kernel-linux-release-simarm-try,vm-kernel-linux-release-simarm64-try,vm-kernel-precomp-android-release-arm_x64-try,vm-kernel-precomp-obfuscate-linux-release-x64-try,dart-sdk-linux-try,analyzer-analysis-server-linux-try,analyzer-linux-release-try,front-end-linux-release-x64-try,vm-kernel-precomp-win-release-x64-try,vm-kernel-mac-debug-x64-try,vm-precomp-ffi-qemu-linux-release-arm-try,vm-kernel-nnbd-linux-debug-x64-try,analyzer-nnbd-linux-release-try,front-end-nnbd-linux-release-x64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/145592 Commit-Queue: Daco Harkes <dacoharkes@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
68 lines
2 KiB
Dart
68 lines
2 KiB
Dart
// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:ffi';
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import 'package:expect/expect.dart';
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import 'dylib_utils.dart';
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void main() {
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print('start main');
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doDynamicLinking();
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int counter = 0;
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void closure() {
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counter++;
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}
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// C holds on to this closure through a `Dart_PersistenHandle`.
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registerClosureCallback(closure);
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// Some time later this closure can be invoked.
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invokeClosureCallback();
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Expect.equals(1, counter);
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// When C is done it needs to stop holding on to the closure such that the
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// Dart GC can collect the closure.
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releaseClosureCallback();
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print('end main');
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}
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final testLibrary = dlopenPlatformSpecific("ffi_test_functions");
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final registerClosureCallback =
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testLibrary.lookupFunction<Void Function(Handle), void Function(Object)>(
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"RegisterClosureCallback");
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final invokeClosureCallback = testLibrary
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.lookupFunction<Void Function(), void Function()>("InvokeClosureCallback");
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final releaseClosureCallback = testLibrary
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.lookupFunction<Void Function(), void Function()>("ReleaseClosureCallback");
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void doClosureCallback(Object callback) {
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final callback_as_function = callback as void Function();
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callback_as_function();
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}
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final closureCallbackPointer =
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Pointer.fromFunction<Void Function(Handle)>(doClosureCallback);
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void doDynamicLinking() {
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Expect.isTrue(NativeApi.majorVersion == 1);
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Expect.isTrue(NativeApi.minorVersion >= 0);
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final initializeApi = testLibrary.lookupFunction<
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IntPtr Function(Pointer<Void>),
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int Function(Pointer<Void>)>("InitDartApiDL");
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Expect.isTrue(initializeApi(NativeApi.initializeApiDLData) == 0);
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final registerClosureCallback = testLibrary.lookupFunction<
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Void Function(Pointer),
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void Function(Pointer)>("RegisterClosureCallbackFP");
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registerClosureCallback(closureCallbackPointer);
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}
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