Setup local var descriptors in kernel mode.

runtime/vm/compiler.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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 1577 matching lines @@
   const Function& function = Function::Handle(code.function());
   ParsedFunction* parsed_function = new ParsedFunction(
       Thread::Current(), Function::ZoneHandle(function.raw()));
   ASSERT(code.var_descriptors() == Object::null());
   // IsIrregexpFunction have eager var descriptors generation.
   ASSERT(!function.IsIrregexpFunction());
   // In background compilation, parser can produce 'errors": bailouts
   // if state changed while compiling in background.
   LongJumpScope jump;
   if (setjmp(*jump.Set()) == 0) {
-    Parser::ParseFunction(parsed_function);
-    parsed_function->AllocateVariables();
+    if (function.kernel_function() == NULL) {
+      Parser::ParseFunction(parsed_function);
+      parsed_function->AllocateVariables();
+    } else {
+      parsed_function->EnsureKernelScopes();
+    }
     const LocalVarDescriptors& var_descs = LocalVarDescriptors::Handle(
         parsed_function->node_sequence()->scope()->GetVarDescriptors(function));
     ASSERT(!var_descs.IsNull());
     code.set_var_descriptors(var_descs);
   } else {
     // Only possible with background compilation.
     ASSERT(Compiler::IsBackgroundCompilation());
   }
 }
 
@@ skipping 706 matching lines @@
 
 
 bool BackgroundCompiler::IsDisabled() {
   UNREACHABLE();
   return true;
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart