Implement new optional parameters syntax in the vm (issue 4290).

runtime/vm/parser.h

 // 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.
 
 #ifndef VM_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "vm/ast.h"
@@ skipping 23 matching lines @@
 
   explicit ParsedFunction(const Function& function)
       : function_(function),
         node_sequence_(NULL),
         instantiator_(NULL),
         default_parameter_values_(Array::Handle()),
         saved_context_var_(NULL),
         expression_temp_var_(NULL),
         first_parameter_index_(0),
         first_stack_local_index_(0),
-        copied_parameter_count_(0),
-        stack_local_count_(0) { }
+        num_copied_params_(0),
+        num_stack_locals_(0) { }
 
   const Function& function() const { return function_; }
 
   SequenceNode* node_sequence() const { return node_sequence_; }
   void SetNodeSequence(SequenceNode* node_sequence);
 
   AstNode* instantiator() const { return instantiator_; }
   void set_instantiator(AstNode* instantiator) {
     // May be NULL.
     instantiator_ = instantiator;
@@ skipping 24 matching lines @@
     ASSERT(!has_expression_temp_var());
     expression_temp_var_ = value;
   }
   bool has_expression_temp_var() const {
     return expression_temp_var_ != NULL;
   }
   static LocalVariable* CreateExpressionTempVar(intptr_t token_pos);
 
   int first_parameter_index() const { return first_parameter_index_; }
   int first_stack_local_index() const { return first_stack_local_index_; }
-  int copied_parameter_count() const { return copied_parameter_count_; }
-  int stack_local_count() const { return stack_local_count_; }
+  int num_copied_params() const { return num_copied_params_; }
+  int num_stack_locals() const { return num_stack_locals_; }
 
   void AllocateVariables();
 
  private:
   const Function& function_;
   SequenceNode* node_sequence_;
   AstNode* instantiator_;
   Array& default_parameter_values_;
   LocalVariable* saved_context_var_;
   LocalVariable* expression_temp_var_;
 
   int first_parameter_index_;
   int first_stack_local_index_;
-  int copied_parameter_count_;
-  int stack_local_count_;
+  int num_copied_params_;
+  int num_stack_locals_;
 
   DISALLOW_COPY_AND_ASSIGN(ParsedFunction);
 };
 
 
 class Parser : public ValueObject {
  public:
   Parser(const Script& script, const Library& library);
   Parser(const Script& script, const Function& function, intptr_t token_pos);
 
@@ skipping 489 matching lines @@
 
   // Allocate temporary only once per function.
   LocalVariable* expression_temp_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_