WIP [esnext] implement async iteration proposal

src/parsing/pattern-rewriter.cc

 // 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.
 
 #include "src/ast/ast.h"
 #include "src/messages.h"
 #include "src/objects-inl.h"
 #include "src/parsing/parameter-initializer-rewriter.h"
 #include "src/parsing/parser.h"
 
@@ skipping 430 matching lines @@
           factory()->NewExpressionStatement(
               factory()->NewAssignment(
                   Token::ASSIGN, factory()->NewVariableProxy(done),
                   factory()->NewBooleanLiteral(true, nopos), nopos),
               nopos),
           zone());
       next_block->statements()->Add(
           factory()->NewExpressionStatement(
               parser_->BuildIteratorNextResult(
                   factory()->NewVariableProxy(iterator), result,
-                  kNoSourcePosition),
+                  IteratorType::kNormal, kNoSourcePosition),
               kNoSourcePosition),
           zone());
       next_block->statements()->Add(inner_if, zone());
 
       if_not_done = factory()->NewIfStatement(
           factory()->NewUnaryOperation(
               Token::NOT, factory()->NewVariableProxy(done), kNoSourcePosition),
           next_block, factory()->NewEmptyStatement(kNoSourcePosition),
           kNoSourcePosition);
     }
@@ skipping 53 matching lines @@
     // done = true;
     Statement* set_done = factory()->NewExpressionStatement(
         factory()->NewAssignment(
             Token::ASSIGN, factory()->NewVariableProxy(done),
             factory()->NewBooleanLiteral(true, nopos), nopos),
         nopos);
 
     // result = IteratorNext(iterator);
     Statement* get_next = factory()->NewExpressionStatement(
         parser_->BuildIteratorNextResult(factory()->NewVariableProxy(iterator),
-                                         result, nopos),
+                                         result, IteratorType::kNormal, nopos),
         nopos);
 
     // %AppendElement(array, result.value);
     Statement* append_element;
     {
       auto args = new (zone()) ZoneList<Expression*>(2, zone());
       args->Add(factory()->NewVariableProxy(array), zone());
       args->Add(factory()->NewProperty(
                     factory()->NewVariableProxy(result),
                     factory()->NewStringLiteral(
@@ skipping 48 matching lines @@
 
     block_->statements()->Add(loop, zone());
     RecurseIntoSubpattern(spread->expression(),
                           factory()->NewVariableProxy(array));
   }
 
   Expression* closing_condition = factory()->NewUnaryOperation(
       Token::NOT, factory()->NewVariableProxy(done), nopos);
 
   parser_->FinalizeIteratorUse(scope(), completion, closing_condition, iterator,
-                               block_, target);
+                               block_, target, IteratorType::kNormal);
   block_ = target;
 }
 
 
 void Parser::PatternRewriter::VisitArrayLiteral(ArrayLiteral* node) {
   Variable* temp_var = nullptr;
   VisitArrayLiteral(node, &temp_var);
 }
 
 
@@ skipping 87 matching lines @@
 NOT_A_PATTERN(TryFinallyStatement)
 NOT_A_PATTERN(UnaryOperation)
 NOT_A_PATTERN(VariableDeclaration)
 NOT_A_PATTERN(WhileStatement)
 NOT_A_PATTERN(WithStatement)
 NOT_A_PATTERN(Yield)
 
 #undef NOT_A_PATTERN
 }  // namespace internal
 }  // namespace v8