[es7] implement exponentiation operator proposal

src/parsing/scanner.h

 // Copyright 2011 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.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #ifndef V8_PARSING_SCANNER_H_
 #define V8_PARSING_SCANNER_H_
 
 #include "src/allocation.h"
@@ skipping 432 matching lines @@
 
   const LiteralBuffer* source_url() const { return &source_url_; }
   const LiteralBuffer* source_mapping_url() const {
     return &source_mapping_url_;
   }
 
   bool IdentifierIsFutureStrictReserved(const AstRawString* string) const;
 
   bool FoundHtmlComment() const { return found_html_comment_; }
 
+#define DECLARE_ACCESSORS(name)                                \
+  inline bool allow_##name() const { return allow_##name##_; } \
+  inline void set_allow_##name(bool allow) { allow_##name##_ = allow; }
+  DECLARE_ACCESSORS(harmony_exponentiation_operator)
+#undef ACCESSOR
+
  private:
   // The current and look-ahead token.
   struct TokenDesc {
     Token::Value token;
     Location location;
     LiteralBuffer* literal_chars;
     LiteralBuffer* raw_literal_chars;
     int smi_value_;
   };
 
@@ skipping 288 matching lines @@
   // Whether there is a line terminator whitespace character after
   // the current token, and  before the next. Does not count newlines
   // inside multiline comments.
   bool has_line_terminator_before_next_;
   // Whether there is a multi-line comment that contains a
   // line-terminator after the current token, and before the next.
   bool has_multiline_comment_before_next_;
 
   // Whether this scanner encountered an HTML comment.
   bool found_html_comment_;
+
+  bool allow_harmony_exponentiation_operator_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_SCANNER_H_