[parser] Refactor AstTraversalVisitor

src/debug/liveedit.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/debug/liveedit.h"
 
 #include "src/ast/scopeinfo.h"
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 1839 matching lines @@
 Handle<JSArray> LiveEditFunctionTracker::Collect(FunctionLiteral* node,
                                                  Handle<Script> script,
                                                  Zone* zone, Isolate* isolate) {
   LiveEditFunctionTracker visitor(script, zone, isolate);
   visitor.VisitFunctionLiteral(node);
   return visitor.result_;
 }
 
 LiveEditFunctionTracker::LiveEditFunctionTracker(Handle<Script> script,
                                                  Zone* zone, Isolate* isolate)
-    : AstTraversalVisitor(isolate) {
+    : AstTraversalVisitor<LiveEditFunctionTracker>(isolate) {
   current_parent_index_ = -1;
   isolate_ = isolate;
   len_ = 0;
   result_ = isolate->factory()->NewJSArray(10);
   script_ = script;
   zone_ = zone;
 }
 
 void LiveEditFunctionTracker::VisitFunctionLiteral(FunctionLiteral* node) {
-  Scope* scope = node->scope();
-
   // FunctionStarted is called in pre-order.
   FunctionStarted(node);
-
-  VisitDeclarations(scope->declarations());
-  VisitStatements(node->body());
-
+  // Recurse using the regular traversal.
+  AstTraversalVisitor::VisitFunctionLiteral(node);
   // FunctionDone are called in post-order.
   // TODO(jgruber): If required, replace the (linear cost)
   // FindSharedFunctionInfo call with a more efficient implementation.
   Handle<SharedFunctionInfo> info =
       script_->FindSharedFunctionInfo(node).ToHandleChecked();
-  FunctionDone(info, scope);
+  FunctionDone(info, node->scope());
 }
 
 void LiveEditFunctionTracker::FunctionStarted(FunctionLiteral* fun) {
   HandleScope handle_scope(isolate_);
   FunctionInfoWrapper info = FunctionInfoWrapper::Create(isolate_);
   info.SetInitialProperties(fun->name(), fun->start_position(),
                             fun->end_position(), fun->parameter_count(),
                             fun->materialized_literal_count(),
                             current_parent_index_);
   current_parent_index_ = len_;
@@ skipping 51 matching lines @@
     scope_info_length++;
 
     current_scope = current_scope->outer_scope();
   }
 
   return scope_info_list;
 }
 
 }  // namespace internal
 }  // namespace v8