[es7] implement exponentiation operator proposal

src/parsing/parser.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_PARSING_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 622 matching lines @@
   V8_INLINE Expression* SpreadCall(Expression* function,
                                    ZoneList<v8::internal::Expression*>* args,
                                    int pos);
   V8_INLINE Expression* SpreadCallNew(Expression* function,
                                       ZoneList<v8::internal::Expression*>* args,
                                       int pos);
 
   // Rewrite all DestructuringAssignments in the current FunctionState.
   V8_INLINE void RewriteDestructuringAssignments();
 
+  V8_INLINE Expression* RewriteAssignExponentiation(Expression* left,
+                                                    Expression* right, int pos);
+
   V8_INLINE void QueueDestructuringAssignmentForRewriting(
       Expression* assignment);
 
   void SetFunctionNameFromPropertyName(ObjectLiteralProperty* property,
                                        const AstRawString* name);
 
   void SetFunctionNameFromIdentifierRef(Expression* value,
                                         Expression* identifier);
 
   // Rewrite expressions that are not used as patterns
@@ skipping 360 matching lines @@
   Expression* SpreadCall(Expression* function,
                          ZoneList<v8::internal::Expression*>* args, int pos);
   Expression* SpreadCallNew(Expression* function,
                             ZoneList<v8::internal::Expression*>* args, int pos);
 
   void SetLanguageMode(Scope* scope, LanguageMode mode);
   void RaiseLanguageMode(LanguageMode mode);
 
   V8_INLINE void RewriteDestructuringAssignments();
 
+  V8_INLINE Expression* RewriteAssignExponentiation(Expression* left,
+                                                    Expression* right, int pos);
+
   friend class NonPatternRewriter;
   V8_INLINE Expression* RewriteSpreads(ArrayLiteral* lit);
 
   V8_INLINE Expression* RewriteNonPattern(
       Expression* expr, const ExpressionClassifier* classifier, bool* ok);
   V8_INLINE ObjectLiteralProperty* RewriteNonPatternObjectLiteralProperty(
       ObjectLiteralProperty* property, const ExpressionClassifier* classifier,
       bool* ok);
 
   friend class InitializerRewriter;
@@ skipping 185 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_