VM: Handle null-case when running with --trace-ic.

runtime/vm/code_generator.cc

 // Copyright (c) 2013, 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/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
@@ skipping 749 matching lines @@
       Function::Handle(cache_class.GetInvocationDispatcher(
           target_name,
           arguments_descriptor,
           RawFunction::kInvokeFieldDispatcher,
           FLAG_lazy_dispatchers));
   ASSERT(!target_function.IsNull() || !FLAG_lazy_dispatchers);
   if (FLAG_trace_ic) {
     OS::PrintErr("InvokeField IC miss: adding <%s> id:%" Pd " -> <%s>\n",
         Class::Handle(receiver.clazz()).ToCString(),
         receiver.GetClassId(),
-        target_function.ToCString());
+        target_function.IsNull() ? "null" : target_function.ToCString());
   }
   *result = target_function.raw();
   return true;
 }
 
 
 // Handle other invocations (implicit closures, noSuchMethod).
 RawFunction* InlineCacheMissHelper(
     const Instance& receiver,
     const ICData& ic_data) {
@@ skipping 12 matching lines @@
     const Function& target_function =
         Function::Handle(receiver_class.GetInvocationDispatcher(
             target_name,
             args_descriptor,
             RawFunction::kNoSuchMethodDispatcher,
             FLAG_lazy_dispatchers));
     if (FLAG_trace_ic) {
       OS::PrintErr("NoSuchMethod IC miss: adding <%s> id:%" Pd " -> <%s>\n",
           Class::Handle(receiver.clazz()).ToCString(),
           receiver.GetClassId(),
-          target_function.ToCString());
+          target_function.IsNull() ? "null" : target_function.ToCString());
     }
     result = target_function.raw();
   }
   // May be null if --no-lazy-dispatchers, in which case dispatch will be
   // handled by InvokeNoSuchMethodDispatcher.
   ASSERT(!result.IsNull() || !FLAG_lazy_dispatchers);
   return result.raw();
 }
 
 static RawFunction* InlineCacheMissHandler(
@@ skipping 1011 matching lines @@
   const intptr_t elm_size = old_data.ElementSizeInBytes();
   const TypedData& new_data =
       TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
   TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
   typed_data_cell.SetAt(0, new_data);
   arguments.SetReturn(new_data);
 }
 
 
 }  // namespace dart