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// Copyright (c) 2014, 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.
import "dart:isolate";
import "dart:async";
import "package:expect/expect.dart";
import "package:async_helper/async_helper.dart";
void toplevel(port, message) {
port.send("toplevel:$message");
}
Function createFuncToplevel() => (p, m) {
p.send(m);
};
class C {
Function initializer;
Function body;
C()
: initializer = ((p, m) {
throw "initializer";
}) {
body = (p, m) {
throw "body";
};
}
static void staticFunc(port, message) {
port.send("static:$message");
}
static Function createFuncStatic() => (p, m) {
throw "static expr";
};
void instanceMethod(p, m) {
throw "instanceMethod";
}
Function createFuncMember() => (p, m) {
throw "instance expr";
};
void call(n, p) {
throw "C";
}
}
class Callable {
void call(p, m) {
p.send(["callable", m]);
}
}
void main() {
asyncStart();
// Sendables are top-level functions and static functions only.
testSendable("toplevel", toplevel);
testSendable("static", C.staticFunc);
// Unsendables are any closure - instance methods or function expression.
var c = new C();
testUnsendable("instance method", c.instanceMethod);
testUnsendable("static context expression", createFuncToplevel());
testUnsendable("static context expression", C.createFuncStatic());
testUnsendable("initializer context expression", c.initializer);
testUnsendable("constructor context expression", c.body);
testUnsendable("instance method context expression", c.createFuncMember());
// The result of `toplevel.call` and `staticFunc.call` may or may not be
// identical to `toplevel` and `staticFunc` respectively. If they are not
// equal, they may or may not be considered toplevel/static functions anyway,
// and therefore sendable. The VM and dart2js currently disagree on whether
// `toplevel` and `toplevel.call` are identical, both allow them to be sent.
// If this is ever specified to something else, use:
// testUnsendable("toplevel.call", toplevel.call);
// testUnsendable("static.call", C.staticFunc.call);
// instead.
// These two tests should be considered canaries for accidental behavior
// change rather than requirements.
testSendable("toplevel", toplevel.call);
testSendable("static", C.staticFunc.call);
// Callable objects are sendable if general objects are (VM yes, dart2js no).
// It's unspecified whether arbitrary objects can be sent. If it is specified,
// add a test that `new Callable()` is either sendable or unsendable.
// The call method of a callable object is a closure holding the object,
// not a top-level or static function, so it should be blocked, just as
// a normal method.
testUnsendable("callable object", new Callable().call);
asyncEnd();
return;
}
// Create a receive port that expects exactly one message.
// Pass the message to `callback` and return the sendPort.
SendPort singleMessagePort(callback) {
var p;
p = new RawReceivePort((v) {
p.close();
callback(v);
});
return p.sendPort;
}
// A singleMessagePort that expects the message to be a specific value.
SendPort expectMessagePort(message) {
asyncStart();
return singleMessagePort((v) {
Expect.equals(message, v);
asyncEnd();
});
}
void testSendable(name, func) {
// Function as spawn message.
Isolate.spawn(callFunc, [func, expectMessagePort("$name:spawn"), "spawn"]);
// Send function to same isolate.
var reply = expectMessagePort("$name:direct");
singleMessagePort(callFunc).send([func, reply, "direct"]);
// Send function to other isolate, call it there.
reply = expectMessagePort("$name:other isolate");
callPort().then((p) {
p.send([func, reply, "other isolate"]);
});
// Round-trip function trough other isolate.
echoPort((roundtripFunc) {
Expect.identical(func, roundtripFunc, "$name:send through isolate");
}).then((port) {
port.send(func);
});
}
// Creates a new isolate and a pair of ports that expect a single message
// to be sent to the other isolate and back to the callback function.
Future<SendPort> echoPort(callback(value)) {
Completer completer = new Completer<SendPort>();
SendPort replyPort = singleMessagePort(callback);
RawReceivePort initPort;
initPort = new RawReceivePort((p) {
completer.complete(p);
initPort.close();
});
return Isolate.spawn(_echo, [replyPort, initPort.sendPort]).then(
(isolate) => completer.future);
}
void _echo(msg) {
var replyPort = msg[0];
RawReceivePort requestPort;
requestPort = new RawReceivePort((msg) {
replyPort.send(msg);
requestPort.close(); // Single echo only.
});
msg[1].send(requestPort.sendPort);
}
// Creates other isolate that waits for a single message, `msg`, on the returned
// port, and executes it as `msg[0](msg[1],msg[2])` in the other isolate.
Future<SendPort> callPort() {
Completer completer = new Completer<SendPort>();
SendPort initPort = singleMessagePort(completer.complete);
return Isolate.spawn(_call, initPort).then((_) => completer.future);
}
void _call(initPort) {
initPort.send(singleMessagePort(callFunc));
}
void testUnsendable(name, func) {
asyncStart();
Isolate.spawn(nop, func).then((v) => throw "allowed spawn direct?",
onError: (e, s) {
asyncEnd();
});
asyncStart();
Isolate.spawn(nop, [func]).then((v) => throw "allowed spawn wrapped?",
onError: (e, s) {
asyncEnd();
});
asyncStart();
var noReply = new RawReceivePort((_) {
throw "Unexpected message: $_";
});
Expect.throws(() {
noReply.sendPort.send(func);
}, null, "send direct");
Expect.throws(() {
noReply.sendPort.send([func]);
}, null, "send wrapped");
scheduleMicrotask(() {
noReply.close();
asyncEnd();
});
// Try sending through other isolate.
asyncStart();
echoPort((v) {
Expect.equals(0, v);
}).then((p) {
try {
p.send(func);
} finally {
p.send(0); // Closes echo port.
}
}).then((p) => throw "unreachable 2", onError: (e, s) {
asyncEnd();
});
}
void nop(_) {}
void callFunc(message) {
message[0](message[1], message[2]);
}