[parser] improve inferred function names for async arrow functions

src/parsing/func-name-inferrer.cc

 // Copyright 2011 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/parsing/func-name-inferrer.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/ast-value-factory.h"
 #include "src/list-inl.h"
 
 namespace v8 {
 namespace internal {
 
 FuncNameInferrer::FuncNameInferrer(AstValueFactory* ast_value_factory,
                                    Zone* zone)
     : ast_value_factory_(ast_value_factory),
       entries_stack_(10, zone),
       names_stack_(5, zone),
       funcs_to_infer_(4, zone),
       zone_(zone) {
 }
 
-

[Dan Ehrenberg, 2016/08/12 21:29:58]

Nit: Revert irrelevant whitespace change.

 void FuncNameInferrer::PushEnclosingName(const AstRawString* name) {
   // Enclosing name is a name of a constructor function. To check
   // that it is really a constructor, we check that it is not empty
   // and starts with a capital letter.
   if (!name->IsEmpty() && unibrow::Uppercase::Is(name->FirstCharacter())) {
     names_stack_.Add(Name(name, kEnclosingConstructorName), zone());
   }
 }
 
 
 void FuncNameInferrer::PushLiteralName(const AstRawString* name) {
   if (IsOpen() && name != ast_value_factory_->prototype_string()) {
     names_stack_.Add(Name(name, kLiteralName), zone());
   }
 }
 
 
 void FuncNameInferrer::PushVariableName(const AstRawString* name) {
   if (IsOpen() && name != ast_value_factory_->dot_result_string()) {
     names_stack_.Add(Name(name, kVariableName), zone());
   }
 }
 
+void FuncNameInferrer::RemoveAsyncKeywordAtIndex(int index) {
+  DCHECK(index >= 0);
+  DCHECK(index < names_stack_.length());
+  DCHECK(names_stack_.at(index).name->IsOneByteEqualTo("async"));
+  names_stack_.Remove(index);
+}
 
 const AstString* FuncNameInferrer::MakeNameFromStack() {
   return MakeNameFromStackHelper(0, ast_value_factory_->empty_string());
 }
 
 const AstString* FuncNameInferrer::MakeNameFromStackHelper(
     int pos, const AstString* prev) {
   if (pos >= names_stack_.length()) return prev;
   if (pos < names_stack_.length() - 1 &&
       names_stack_.at(pos).type == kVariableName &&
@@ skipping 19 matching lines @@
   const AstString* func_name = MakeNameFromStack();
   for (int i = 0; i < funcs_to_infer_.length(); ++i) {
     funcs_to_infer_[i]->set_raw_inferred_name(func_name);
   }
   funcs_to_infer_.Rewind(0);
 }
 
 
 }  // namespace internal
 }  // namespace v8