Disallow tail calls from async functions and generators

src/parsing/parser-base.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_BASE_H
 #define V8_PARSING_PARSER_BASE_H
 
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/base/hashmap.h"
@@ skipping 2555 matching lines @@
   //   'continue' MemberExpression  TemplateLiteral
   //   'continue' CallExpression  TemplateLiteral
   Expect(Token::CONTINUE, CHECK_OK);
   int pos = position();
   int sub_expression_pos = peek_position();
   ExpressionT expression =
       this->ParseLeftHandSideExpression(classifier, CHECK_OK);
   CheckNoTailCallExpressions(classifier, CHECK_OK);
 
   Scanner::Location loc(pos, scanner()->location().end_pos);
+
   if (!expression->IsCall()) {
     Scanner::Location sub_loc(sub_expression_pos, loc.end_pos);
     impl()->ReportMessageAt(sub_loc,
                             MessageTemplate::kUnexpectedInsideTailCall);
     *ok = false;
     return impl()->EmptyExpression();
   }
   if (impl()->IsDirectEvalCall(expression)) {
     Scanner::Location sub_loc(sub_expression_pos, loc.end_pos);
     impl()->ReportMessageAt(sub_loc,
                             MessageTemplate::kUnexpectedTailCallOfEval);
     *ok = false;
     return impl()->EmptyExpression();
   }
   if (!is_strict(language_mode())) {
     impl()->ReportMessageAt(loc, MessageTemplate::kUnexpectedSloppyTailCall);
     *ok = false;
     return impl()->EmptyExpression();
   }
+  if (is_resumable()) {
+    Scanner::Location sub_loc(sub_expression_pos, loc.end_pos);
+    impl()->ReportMessageAt(sub_loc, MessageTemplate::kUnexpectedTailCall);
+    *ok = false;
+    return impl()->EmptyExpression();
+  }
   ReturnExprContext return_expr_context =
       function_state_->return_expr_context();
   if (return_expr_context != ReturnExprContext::kInsideValidReturnStatement) {
     MessageTemplate::Template msg = MessageTemplate::kNone;
     switch (return_expr_context) {
       case ReturnExprContext::kInsideValidReturnStatement:
         UNREACHABLE();
         return impl()->EmptyExpression();
       case ReturnExprContext::kInsideValidBlock:
         msg = MessageTemplate::kUnexpectedTailCall;
@@ skipping 1111 matching lines @@
     has_seen_constructor_ = true;
     return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H