Load the native call wrapper via Thread.

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 11018 matching lines @@
     for (intptr_t i = 0; i < Length(); i++) {
       switch (InfoAt(i)) {
       case ObjectPool::kTaggedObject:
         obj = ObjectAt(i);
         jsarr.AddValue(obj);
         break;
       case ObjectPool::kImmediate:
         imm = RawValueAt(i);
         jsarr.AddValue64(imm);
         break;
-      case ObjectPool::kExternalLabel:
       case ObjectPool::kNativeEntry:
         imm = RawValueAt(i);
         jsarr.AddValueF("0x%" Px, imm);
         break;
       default:
         UNREACHABLE();
       }
     }
   }
 }
 
 
-static const char* DescribeExternalLabel(uword addr) {
-  const char* stub_name = StubCode::NameOfStub(addr);
-  if (stub_name != NULL) {
-    return stub_name;
-  }
-
-  return "UNKNOWN";
-}
-
-
 void ObjectPool::DebugPrint() const {
   THR_Print("Object Pool: {\n");
   for (intptr_t i = 0; i < Length(); i++) {
     intptr_t offset = OffsetFromIndex(i);
     THR_Print("  %" Pd " PP+0x%" Px ": ", i, offset);
     if (InfoAt(i) == kTaggedObject) {
       RawObject* obj = ObjectAt(i);
       THR_Print("0x%" Px " %s (obj)\n",
           reinterpret_cast<uword>(obj),
           Object::Handle(obj).ToCString());
-    } else if (InfoAt(i) == kExternalLabel) {
-      uword addr = RawValueAt(i);
-      THR_Print("0x%" Px " (external label: %s)\n",
-                addr, DescribeExternalLabel(addr));
     } else if (InfoAt(i) == kNativeEntry) {
       THR_Print("0x%" Px " (native entry)\n", RawValueAt(i));
     } else {
       THR_Print("0x%" Px " (raw)\n", RawValueAt(i));
     }
   }
   THR_Print("}\n");
 }
 
 
@@ skipping 10331 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart