Fix crash when running with --report_invocation_count.

runtime/vm/isolate.cc

 // Copyright (c) 2011, 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/isolate.h"
 
 #include "include/dart_api.h"
 
 #include "vm/assert.h"
 #include "vm/bigint_store.h"
@@ skipping 155 matching lines @@
   HandleScope handle_scope;
   Library& library = Library::Handle();
   library = object_store()->registered_libraries();
   GrowableArray<const Function*> invoked_functions;
   while (!library.IsNull()) {
     Class& cls = Class::Handle();
     ClassDictionaryIterator iter(library);
     while (iter.HasNext()) {
       cls = iter.GetNextClass();
       const Array& functions = Array::Handle(cls.functions());
-      for (int j = 0; j < functions.Length(); j++) {
+      // Class 'Dynamic' is allocated/initialized in a special way, leaving
+      // the functions field NULL instead of empty.
+      int func_len = functions.IsNull() ? 0 : functions.Length();

[regis, 2011/11/09 01:51:08]

const

[srdjan, 2011/11/09 16:25:06]

Done.

+      for (int j = 0; j < func_len; j++) {
         Function& function = Function::Handle();
         function ^= functions.At(j);
         if (function.invocation_counter() > 0) {
           invoked_functions.Add(&function);
         }
       }
     }
     library = library.next_registered();
   }
   invoked_functions.Sort(MostCalledFunctionFirst);
@@ skipping 93 matching lines @@
   // Visit all objects in the code index table.
   if (code_index_table() != NULL) {
     code_index_table()->VisitObjectPointers(visitor);
   }
 
   // Visit the top context which is stored in the isolate.
   visitor->VisitPointer(reinterpret_cast<RawObject**>(&top_context_));
 }
 
 }  // namespace dart