[es6] Implement for-of iterator finalization

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 443 matching lines @@
   // Generate AST node that throws a TypeError with the given
   // type. Both arguments must be non-null (in the handle sense).
   Expression* NewThrowTypeError(MessageTemplate::Template message,
                                 const AstRawString* arg, int pos);
 
   // Generic AST generator for throwing errors from compiled code.
   Expression* NewThrowError(Runtime::FunctionId function_id,
                             MessageTemplate::Template message,
                             const AstRawString* arg, int pos);
 
+  Statement* FinalizeForOfStatement(ForOfStatement* loop, int pos);
+
   // Reporting errors.
   void ReportMessageAt(Scanner::Location source_location,
                        MessageTemplate::Template message,
                        const char* arg = NULL,
                        ParseErrorType error_type = kSyntaxError);
   void ReportMessage(MessageTemplate::Template message, const char* arg = NULL,
                      ParseErrorType error_type = kSyntaxError);
   void ReportMessage(MessageTemplate::Template message, const AstRawString* arg,
                      ParseErrorType error_type = kSyntaxError);
   void ReportMessageAt(Scanner::Location source_location,
@@ skipping 181 matching lines @@
   V8_INLINE ObjectLiteralProperty* RewriteNonPatternObjectLiteralProperty(
       ObjectLiteralProperty* property, const ExpressionClassifier* classifier,
       bool* ok);
 
   Expression* RewriteYieldStar(
       Expression* generator, Expression* expression, int pos);
 
  private:
   Parser* parser_;
 
-  void BuildIteratorClose(ZoneList<Statement*>* statements, Variable* iterator,
-                          Maybe<Variable*> input, Maybe<Variable*> output);
+  void BuildIteratorClose(
+      ZoneList<Statement*>* statements, Variable* iterator,
+      Expression* input, Variable* output);
+  void BuildIteratorCloseForCompletion(
+      ZoneList<Statement*>* statements, Variable* iterator,
+      Variable* body_threw);
 };
 
 
 class Parser : public ParserBase<ParserTraits> {
  public:
   explicit Parser(ParseInfo* info);
   ~Parser() {
     delete reusable_preparser_;
     reusable_preparser_ = NULL;
     delete cached_parse_data_;
@@ skipping 543 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_