Dump more info before crashing.

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 6400 matching lines @@
     TypeTestKind test_kind,
     intptr_t parameter_position,
     intptr_t other_parameter_position,
     const TypeArguments& type_arguments,
     const Function& other,
     const TypeArguments& other_type_arguments,
     Error* bound_error,
     Heap::Space space) const {
   AbstractType& other_param_type =
       AbstractType::Handle(other.ParameterTypeAt(other_parameter_position));
+
+  // TODO(regis): Remove this debugging code.
+  if (other_param_type.IsNull()) {
+    const Class& owner = Class::Handle(Owner());
+    const Class& other_owner = Class::Handle(other.Owner());
+    THR_Print("*** null other_param_type ***\n");
+    THR_Print("parameter_position: %" Pd "\n", parameter_position);
+    THR_Print("other_parameter_position: %" Pd "\n", other_parameter_position);
+    THR_Print("function: %s\n", ToCString());
+    THR_Print("function owner: %s\n", owner.ToCString());
+    THR_Print("other function: %s\n", other.ToCString());
+    THR_Print("other function owner: %s\n", other_owner.ToCString());
+    AbstractType& param_type =
+        AbstractType::Handle(ParameterTypeAt(parameter_position));
+    THR_Print("param_type: %s\n", param_type.ToCString());
+  }
+
   if (!other_param_type.IsInstantiated()) {
     other_param_type =
         other_param_type.InstantiateFrom(other_type_arguments,
                                          bound_error,
                                          NULL,  // instantiation_trail
                                          NULL,  // bound_trail
                                          space);
     ASSERT((bound_error == NULL) || bound_error->IsNull());
   }
   if (other_param_type.IsDynamicType()) {
     return true;
   }
   AbstractType& param_type =
       AbstractType::Handle(ParameterTypeAt(parameter_position));
+
+  // TODO(regis): Remove this debugging code.
+  if (param_type.IsNull()) {
+    const Class& owner = Class::Handle(Owner());
+    const Class& other_owner = Class::Handle(other.Owner());
+    THR_Print("*** null param_type ***\n");
+    THR_Print("parameter_position: %" Pd "\n", parameter_position);
+    THR_Print("other_parameter_position: %" Pd "\n", other_parameter_position);
+    THR_Print("function: %s\n", ToCString());
+    THR_Print("function owner: %s\n", owner.ToCString());
+    THR_Print("other function: %s\n", other.ToCString());
+    THR_Print("other function owner: %s\n", other_owner.ToCString());
+    THR_Print("other_param_type: %s\n", other_param_type.ToCString());
+  }
+
   if (!param_type.IsInstantiated()) {
     param_type = param_type.InstantiateFrom(type_arguments,
                                             bound_error,
                                             NULL,  // instantiation_trail
                                             NULL,  // bound_trail
                                             space);
     ASSERT((bound_error == NULL) || bound_error->IsNull());
   }
   if (param_type.IsDynamicType()) {
     return test_kind == kIsSubtypeOf;
@@ skipping 15845 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart