blob: ad315fbd8b66ce5c7c8e8f8d5284009d34948347 [file] [log] [blame]
// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
//
// SharedObjects=ffi_test_functions
import 'dart:ffi';
import 'dart:io';
import 'ffi_test_helpers.dart';
void main() {
testMallocFree();
print('end of test, shutting down');
}
void testMallocFree() {
if (Platform.isWindows) {
// malloc and free not supported.
return;
}
print('freePtr $freePtr');
{
final resource = MyNativeResource();
resource.close();
doGC();
}
{
MyNativeResource();
doGC();
}
// Run finalizer on shutdown (or on a GC that runs before shutdown).
MyNativeResource();
}
class MyNativeResource implements Finalizable {
final Pointer<Void> pointer;
bool _closed = false;
MyNativeResource._(this.pointer, {int? externalSize}) {
print('pointer $pointer');
freeFinalizer.attach(this, pointer,
externalSize: externalSize, detach: this);
}
factory MyNativeResource() {
const num = 1;
const size = 16;
final pointer = calloc(num, size);
return MyNativeResource._(pointer, externalSize: size);
}
/// Eagerly stop using the native resource. Cancelling the finalizer.
void close() {
_closed = true;
freeFinalizer.detach(this);
free(pointer);
}
void useResource() {
if (_closed) {
throw UnsupportedError('The native resource has already been released');
}
print(pointer.address);
}
}
final DynamicLibrary stdlib = DynamicLibrary.process();
typedef PosixCallocNative = Pointer<Void> Function(IntPtr num, IntPtr size);
typedef PosixCalloc = Pointer<Void> Function(int num, int size);
final PosixCalloc calloc =
stdlib.lookupFunction<PosixCallocNative, PosixCalloc>('calloc');
typedef PosixFreeNative = Void Function(Pointer<Void>);
final freePtr = stdlib.lookup<NativeFunction<PosixFreeNative>>('free');
final free = freePtr.asFunction<void Function(Pointer<Void>)>();
final freeFinalizer = NativeFinalizer(freePtr);