Modifies assertion for possibly null code pointer.

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/bigint_operations.h"
 #include "vm/code_patcher.h"
@@ skipping 1365 matching lines @@
       function.ToFullyQualifiedCString());
 }
 
 
 // This is called from function that needs to be optimized.
 // The requesting function can be already optimized (reoptimization).
 // Returns the Code object where to continue execution.
 DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
   const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
   ASSERT(!function.IsNull());
+  ASSERT(function.HasCode());
 
   if (CanOptimizeFunction(function, isolate)) {
     const Error& error =
         Error::Handle(Compiler::CompileOptimizedFunction(function));
     if (!error.IsNull()) {
       Exceptions::PropagateError(error);
     }
     const Code& optimized_code = Code::Handle(function.CurrentCode());
     ASSERT(!optimized_code.IsNull());
     // Reset usage counter for reoptimization.
@@ skipping 38 matching lines @@
     ASSERT(!target_code.is_optimized());
     target_function.ReattachCode(target_code);
   }
   if (FLAG_trace_patching) {
     OS::PrintErr("FixCallersTarget: patching from %#" Px " to '%s' %#" Px "\n",
         frame->pc(),
         Function::Handle(target_code.function()).ToFullyQualifiedCString(),
         target_code.EntryPoint());
   }
   arguments.SetReturn(target_code);
+  ASSERT(target_function.HasCode());
 }
 
 
 const char* DeoptReasonToText(intptr_t deopt_id) {
   switch (deopt_id) {
 #define DEOPT_REASON_ID_TO_TEXT(name) case kDeopt##name: return #name;
 DEOPT_REASONS(DEOPT_REASON_ID_TO_TEXT)
 #undef DEOPT_REASON_ID_TO_TEXT
     default:
       UNREACHABLE();
@@ skipping 261 matching lines @@
   field.UpdateCid(cid);
   intptr_t list_length = Field::kNoFixedLength;
   if ((field.guarded_cid() != kDynamicCid) &&
       field.is_final() && RawObject::IsBuiltinListClassId(cid)) {
     list_length = GetListLength(value);
   }
   field.UpdateLength(list_length);
 }
 
 }  // namespace dart