Add a generic mechanism for expression rewriting

src/ast/ast-expression-rewriter.h

+// Copyright 2015 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_EXPRESSION_REWRITER_H_
+#define V8_AST_AST_EXPRESSION_REWRITER_H_
+
+#include "src/allocation.h"
+#include "src/ast/ast.h"
+#include "src/ast/scopes.h"
+#include "src/effects.h"
+#include "src/type-info.h"
+#include "src/types.h"
+#include "src/zone.h"
+
+namespace v8 {
+namespace internal {
+
+// A rewriting Visitor over a CompilationInfo's AST that invokes
+// VisitExpression on each expression node.
+
+class AstExpressionRewriter : public AstVisitor {
+ public:
+  explicit AstExpressionRewriter(Isolate* isolate) : AstVisitor() {
+    InitializeAstRewriter(isolate);
+  }
+  explicit AstExpressionRewriter(uintptr_t stack_limit) : AstVisitor() {
+    InitializeAstRewriter(stack_limit);
+  }
+  ~AstExpressionRewriter() override {}
+
+  void VisitDeclarations(ZoneList<Declaration*>* declarations) override;
+  void VisitStatements(ZoneList<Statement*>* statements) override;
+  void VisitExpressions(ZoneList<Expression*>* expressions) override;
+
+  virtual void VisitObjectLiteralProperty(ObjectLiteralProperty* property);
+
+ protected:
+  virtual bool RewriteExpression(Expression* expr) = 0;
+
+ private:
+  DEFINE_AST_REWRITER_SUBCLASS_MEMBERS();
+
+#define DECLARE_VISIT(type) void Visit##type(type* node) override;
+  AST_NODE_LIST(DECLARE_VISIT)
+#undef DECLARE_VISIT
+
+  DISALLOW_COPY_AND_ASSIGN(AstExpressionRewriter);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_AST_AST_EXPRESSION_REWRITER_H_