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

runtime/vm/ast_printer.cc

 // 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.
 
 #include "vm/ast_printer.h"
 
 #include "vm/handles.h"
 #include "vm/object.h"
 #include "vm/os.h"
 #include "vm/parser.h"
@@ skipping 431 matching lines @@
   ASSERT(scope != NULL);
   const char* function_name = function.ToFullyQualifiedCString();
   OS::Print("Scope for function '%s' {scope %p ", function_name, scope);
   if (scope->HasContextLevel()) {
     OS::Print("ctx %d numctxvar %d ",
               scope->context_level(),
               scope->num_context_variables());
   }
   OS::Print("llev %d ", scope->loop_level());
   const int num_fixed_params = function.num_fixed_parameters();
-  const int num_opt_params = function.num_optional_parameters();
-  const int num_params = num_fixed_params + num_opt_params;
+  const int num_opt_pos_params = function.num_optional_positional_parameters();
+  const int num_opt_named_params = function.num_optional_named_parameters();
+  const int num_params =
+      num_fixed_params + num_opt_pos_params + num_opt_named_params;
   // Parameters must be listed first and must all appear in the top scope.
   ASSERT(num_params <= scope->num_variables());
   int pos = 0;  // Current position of variable in scope.
   while (pos < num_params) {
     LocalVariable* param = scope->VariableAt(pos);
     ASSERT(param->owner() == scope);
     OS::Print("(param %s%s '%s'",
               param->is_final() ? "final " : "",
               String::Handle(param->type().Name()).ToCString(),
               param->name().ToCString());
@@ skipping 26 matching lines @@
   ASSERT(node_sequence != NULL);
   AstPrinter ast_printer;
   const char* function_name =
       parsed_function.function().ToFullyQualifiedCString();
   OS::Print("Ast for function '%s' {\n", function_name);
   node_sequence->Visit(&ast_printer);
   OS::Print("}\n");
 }
 
 }  // namespace dart