Updated VM stacktrace support (20898) with strndup impl.

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 1238 matching lines @@
     Dart_IsolateInterruptCallback callback = isolate->InterruptCallback();
     if (callback) {
       if ((*callback)()) {
         return;
       } else {
         // TODO(turnidge): Unwind the stack.
         UNIMPLEMENTED();
       }
     }
   }
+  if (interrupt_bits & Isolate::kVmStatusInterrupt) {
+    Dart_IsolateInterruptCallback callback = isolate->VmStatsCallback();
+    if (callback) {
+      (*callback)();
+    }
+  }
 }
 
 
 DEFINE_RUNTIME_ENTRY(TraceICCall, 2) {
   ASSERT(arguments.ArgCount() ==
          kTraceICCallRuntimeEntry.argument_count());
   const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(0));
   const Function& function = Function::CheckedHandle(arguments.ArgAt(1));
   DartFrameIterator iterator;
   StackFrame* frame = iterator.NextFrame();
@@ skipping 450 matching lines @@
 //   Arg1: Value that is being stored.
 DEFINE_RUNTIME_ENTRY(UpdateFieldCid, 2) {
   ASSERT(arguments.ArgCount() == kUpdateFieldCidRuntimeEntry.argument_count());
   const Field& field = Field::CheckedHandle(arguments.ArgAt(0));
   const Object& value = Object::Handle(arguments.ArgAt(1));
 
   field.UpdateCid(Class::Handle(value.clazz()).id());
 }
 
 }  // namespace dart