Fix crash when posting a message to a send port with port id 0.

runtime/vm/object.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 20052 matching lines @@
 
 
 void Capability::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 RawReceivePort* ReceivePort::New(Dart_Port id,
                                  bool is_control_port,
                                  Heap::Space space) {
+  ASSERT(id != ILLEGAL_PORT);
   Isolate* isolate = Isolate::Current();
   const SendPort& send_port =
       SendPort::Handle(isolate, SendPort::New(id, isolate->origin_id()));
 
   ReceivePort& result = ReceivePort::Handle(isolate);
   {
     RawObject* raw = Object::Allocate(ReceivePort::kClassId,
                                       ReceivePort::InstanceSize(),
                                       space);
     NoSafepointScope no_safepoint;
@@ skipping 20 matching lines @@
 
 
 RawSendPort* SendPort::New(Dart_Port id, Heap::Space space) {
   return New(id, Isolate::Current()->origin_id(), space);
 }
 
 
 RawSendPort* SendPort::New(Dart_Port id,
                            Dart_Port origin_id,
                            Heap::Space space) {
+  ASSERT(id != ILLEGAL_PORT);
   SendPort& result = SendPort::Handle();
   {
     RawObject* raw = Object::Allocate(SendPort::kClassId,
                                       SendPort::InstanceSize(),
                                       space);
     NoSafepointScope no_safepoint;
     result ^= raw;
     result.StoreNonPointer(&result.raw_ptr()->id_, id);
     result.StoreNonPointer(&result.raw_ptr()->origin_id_, origin_id);
   }
@@ skipping 594 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart