Desugar async/await to create the resulting Promise upfront

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 1104 matching lines @@
   // In this case, it'll reset the scanner using the bookmark.
   void SkipLazyFunctionBody(int* materialized_literal_count,
                             int* expected_property_count, bool* ok,
                             Scanner::BookmarkScope* bookmark = nullptr);
 
   PreParser::PreParseResult ParseLazyFunctionBodyWithPreParser(
       SingletonLogger* logger, Scanner::BookmarkScope* bookmark = nullptr);
 
   Block* BuildParameterInitializationBlock(
       const ParserFormalParameters& parameters, bool* ok);
-  Block* BuildRejectPromiseOnException(Block* block);
+  Block* BuildRejectPromiseOnException(Block* block, bool* ok);
 
   // Consumes the ending }.
   ZoneList<Statement*>* ParseEagerFunctionBody(
       const AstRawString* function_name, int pos,
       const ParserFormalParameters& parameters, FunctionKind kind,
       FunctionLiteral::FunctionType function_type, bool* ok);
 
   void ThrowPendingError(Isolate* isolate, Handle<Script> script);
 
   TemplateLiteralState OpenTemplateLiteral(int pos);
@@ skipping 25 matching lines @@
 
   friend class NonPatternRewriter;
   V8_INLINE Expression* RewriteSpreads(ArrayLiteral* lit);
 
   V8_INLINE void RewriteNonPattern(ExpressionClassifier* classifier, bool* ok);
 
   friend class InitializerRewriter;
   void RewriteParameterInitializer(Expression* expr, Scope* scope);
 
   Expression* BuildCreateJSGeneratorObject(int pos, FunctionKind kind);
-  Expression* BuildPromiseResolve(Expression* value, int pos);
-  Expression* BuildPromiseReject(Expression* value, int pos);
+  Expression* BuildResolvePromise(Expression* value, int pos);
+  Expression* BuildRejectPromise(Expression* value, int pos);
+  VariableProxy* BuildDotPromise();
+  VariableProxy* BuildDebugIsActive();
 
   Scanner scanner_;
   PreParser* reusable_preparser_;
   Scope* original_scope_;  // for ES5 function declarations in sloppy eval
   Target* target_stack_;  // for break, continue statements
   ScriptCompiler::CompileOptions compile_options_;
   ParseData* cached_parse_data_;
 
   PendingCompilationErrorHandler pending_error_handler_;
 
@@ skipping 168 matching lines @@
 
 void ParserTraits::AddParameterInitializationBlock(
     const ParserFormalParameters& parameters,
     ZoneList<v8::internal::Statement*>* body, bool is_async, bool* ok) {
   if (!parameters.is_simple) {
     auto* init_block =
         parser_->BuildParameterInitializationBlock(parameters, ok);
     if (!*ok) return;
 
     if (is_async) {
-      init_block = parser_->BuildRejectPromiseOnException(init_block);
+      init_block = parser_->BuildRejectPromiseOnException(init_block, ok);
+      if (!*ok) return;
     }
 
     if (init_block != nullptr) {
       body->Add(init_block, parser_->zone());
     }
   }
 }
 
 Expression* ParserTraits::ParseAsyncFunctionExpression(bool* ok) {
   return parser_->ParseAsyncFunctionExpression(ok);
 }
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_