Add "checked" parameter to Isolate.spawnUri.

runtime/lib/isolate_patch.dart

Index: runtime/lib/isolate_patch.dart
diff --git a/runtime/lib/isolate_patch.dart b/runtime/lib/isolate_patch.dart
index 100d951a647eff1d70e0cb69176bc54a1a069e32..2d20d0e5559d7e822a96cf1cd450d7c0b133d692 100644
--- a/runtime/lib/isolate_patch.dart
+++ b/runtime/lib/isolate_patch.dart
@@ -303,7 +303,7 @@ patch class Isolate {
 
   /* patch */ static Future<Isolate> spawnUri(
       Uri uri, List<String> args, var message,
-      { bool paused: false, Uri packageRoot }) {
+      { bool paused: false, bool checked, Uri packageRoot }) {
     // `paused` isn't handled yet.
     RawReceivePort readyPort;
     try {
@@ -311,8 +311,12 @@ patch class Isolate {
       readyPort = new RawReceivePort();
       var packageRootString =
           (packageRoot == null) ? null : packageRoot.toString();
+      if (checked == null) {
+        checked = false;
+        assert((checked = true));

[Ivan Posva, 2015/05/29 15:18:17]

?

[Lasse Reichstein Nielsen, 2015/06/02 15:26:44]

Just a way to get the checked-mode state of the current isolate in Dart code.
If the VM allows assertion statements to be different from type assertions, then
it's probably not safe.

[Ivan Posva, 2015/06/02 17:49:31]

Assertions and checked mode are two different concepts in the VM which are both
enabled by passing the --checked flag on the command line. They can be enabled
individually if so desired.

+      }
       _spawnUri(readyPort.sendPort, uri.toString(), args, message,
-                paused, packageRootString);
+                paused, checked, packageRootString);

[Ivan Posva, 2015/05/29 15:18:17]

Please pass the exact parameter down to the native code, so that we can inherit
when setting up the isolate spawn state.

[Lasse Reichstein Nielsen, 2015/06/02 15:26:44]

Done.

       Completer completer = new Completer<Isolate>.sync();
       readyPort.handler = (readyMessage) {
         readyPort.close();
@@ -354,7 +358,7 @@ patch class Isolate {
 
   static void _spawnUri(SendPort readyPort, String uri,
                         List<String> args, var message,
-                        bool paused, String packageRoot)
+                        bool paused, bool checked, String packageRoot)
       native "Isolate_spawnUri";
 
   static void _sendOOB(port, msg) native "Isolate_sendOOB";