[es6] implement default/optional parameters (WIP / comments)

src/ast-numbering.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/scopes.h"
 
@@ skipping 505 matching lines @@
 void AstNumberingVisitor::VisitArguments(ZoneList<Expression*>* arguments) {
   for (int i = 0; i < arguments->length(); i++) {
     Visit(arguments->at(i));
   }
 }
 
 
 void AstNumberingVisitor::VisitFunctionLiteral(FunctionLiteral* node) {
   IncrementNodeCount();
   node->set_base_id(ReserveIdRange(FunctionLiteral::num_ids()));
+  if (node->default_values()->length()) {
+    VisitArguments(node->default_values());
+  }
+
   // We don't recurse into the declarations or body of the function literal:
   // you have to separately Renumber() each FunctionLiteral that you compile.
 }
 
 
 bool AstNumberingVisitor::Finish(FunctionLiteral* node) {
   node->set_ast_properties(&properties_);
   node->set_dont_optimize_reason(dont_optimize_reason());
   return !HasStackOverflow();
 }
 
 
 bool AstNumberingVisitor::Renumber(FunctionLiteral* node) {
   Scope* scope = node->scope();
 
   if (scope->HasIllegalRedeclaration()) {
     scope->VisitIllegalRedeclaration(this);
     DisableOptimization(kFunctionWithIllegalRedeclaration);
     return Finish(node);
   }
   if (scope->calls_eval()) DisableOptimization(kFunctionCallsEval);
   if (scope->arguments() != NULL && !scope->arguments()->IsStackAllocated()) {
     DisableOptimization(kContextAllocatedArguments);
   }
 
+  VisitExpressions(node->default_values());
+
   VisitDeclarations(scope->declarations());
   if (scope->is_function_scope() && scope->function() != NULL) {
     // Visit the name of the named function expression.
     Visit(scope->function());
   }
   VisitStatements(node->body());
 
   return Finish(node);
 }
 
 
 bool AstNumbering::Renumber(Isolate* isolate, Zone* zone,
                             FunctionLiteral* function) {
   AstNumberingVisitor visitor(isolate, zone);
   return visitor.Renumber(function);
 }
 }
 }  // namespace v8::internal