Cache current thread in a reserved register and use it in LoadIsolate

runtime/vm/dart_entry.h

 // 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.
 
 #ifndef VM_DART_ENTRY_H_
 #define VM_DART_ENTRY_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 
@@ skipping 84 matching lines @@
 };
 
 
 // DartEntry abstracts functionality needed to resolve dart functions
 // and invoke them from C++.
 class DartEntry : public AllStatic {
  public:
   // On success, returns a RawInstance.  On failure, a RawError.
   typedef RawObject* (*invokestub)(uword entry_point,
                                    const Array& arguments_descriptor,
-                                   const Array& arguments);
+                                   const Array& arguments,
+                                   Thread* thread);
 
   // Invokes the specified instance function or static function.
   // The first argument of an instance function is the receiver.
   // On success, returns a RawInstance.  On failure, a RawError.
   // This is used when there are no named arguments in the call.
   static RawObject* InvokeFunction(const Function& function,
                                    const Array& arguments);
 
   // Invokes the specified instance, static, or closure function.
   // On success, returns a RawInstance.  On failure, a RawError.
@@ skipping 50 matching lines @@
   //
   // Returns null on success, a RawError on failure.
   static RawObject* MapSetAt(const Instance& map,
                              const Instance& key,
                              const Instance& value);
 };
 
 }  // namespace dart
 
 #endif  // VM_DART_ENTRY_H_