Fix for issues 6080 - pass in the Isolate's top context into the stub for invoking dart code from n…

runtime/vm/parser.h

Index: runtime/vm/parser.h
===================================================================
--- runtime/vm/parser.h	(revision 18232)
+++ runtime/vm/parser.h	(working copy)
@@ -37,6 +37,7 @@
         node_sequence_(NULL),
         instantiator_(NULL),
         default_parameter_values_(Array::ZoneHandle()),
+        saved_current_context_var_(NULL),
         saved_entry_context_var_(NULL),
         expression_temp_var_(NULL),
         first_parameter_index_(0),
@@ -65,6 +66,14 @@
     default_parameter_values_ = default_parameter_values.raw();
   }
 
+  LocalVariable* saved_current_context_var() const {
+    return saved_current_context_var_;
+  }
+  void set_saved_current_context_var(LocalVariable* saved_current_context_var) {
+    ASSERT(saved_current_context_var != NULL);
+    saved_current_context_var_ = saved_current_context_var;
+  }
+
   LocalVariable* saved_entry_context_var() const {
     return saved_entry_context_var_;
   }
@@ -102,6 +111,7 @@
   SequenceNode* node_sequence_;
   AstNode* instantiator_;
   Array& default_parameter_values_;
+  LocalVariable* saved_current_context_var_;
   LocalVariable* saved_entry_context_var_;
   LocalVariable* expression_temp_var_;
 
@@ -584,6 +594,7 @@
 
   const LocalVariable* GetIncrementTempLocal();
   void EnsureExpressionTemp();
+  void EnsureSavedCurrentContext();
   AstNode* CreateAssignmentNode(AstNode* original, AstNode* rhs);
   AstNode* InsertClosureCallNodes(AstNode* condition);
 
@@ -633,6 +644,9 @@
   // Allocate temporary only once per function.
   LocalVariable* expression_temp_;
 
+  // Allocate saved current context only if needed.
+  LocalVariable* saved_current_context_;
+
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };