Refactor duplicate logic in Ast{Traversal,Expression}Visitor

src/ast/ast.h

 // 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.
 
 #ifndef V8_AST_AST_H_
 #define V8_AST_AST_H_
 
 #include "src/assembler.h"
 #include "src/ast/ast-value-factory.h"
 #include "src/ast/modules.h"
@@ skipping 3035 matching lines @@
   } while (false)
 
 
 // ----------------------------------------------------------------------------
 // Traversing visitor
 // - fully traverses the entire AST.
 
 class AstTraversalVisitor : public AstVisitor {
  public:
   explicit AstTraversalVisitor(Isolate* isolate);
+  explicit AstTraversalVisitor(uintptr_t stack_limit);
   virtual ~AstTraversalVisitor() {}
 
   // Iteration left-to-right.
   void VisitDeclarations(ZoneList<Declaration*>* declarations) override;
   void VisitStatements(ZoneList<Statement*>* statements) override;
-  void VisitExpressions(ZoneList<Expression*>* expressions) override;
 
 // Individual nodes
 #define DECLARE_VISIT(type) void Visit##type(type* node) override;
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
+ protected:
+  int depth() { return depth_; }
+
  private:
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
+
+  int depth_;
+
   DISALLOW_COPY_AND_ASSIGN(AstTraversalVisitor);
 };
 
 // ----------------------------------------------------------------------------
 // AstNode factory
 
 class AstNodeFactory final BASE_EMBEDDED {
  public:
   explicit AstNodeFactory(AstValueFactory* ast_value_factory)
       : local_zone_(ast_value_factory->zone()),
@@ skipping 488 matching lines @@
                                     : NULL;                                   \
   }
 AST_NODE_LIST(DECLARE_NODE_FUNCTIONS)
 #undef DECLARE_NODE_FUNCTIONS
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_AST_H_