Reland Create JSPromise (patchset #16 id:300001 of https://codereview.chromium.org/2536463002/ )"

src/objects-printer.cc

 // 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.
 
 #include "src/objects.h"
 
 #include <iomanip>
 #include <memory>
 
 #include "src/bootstrapper.h"
@@ skipping 132 matching lines @@
       break;
 
     case FILLER_TYPE:
       os << "filler";
       break;
     case JS_OBJECT_TYPE:  // fall through
     case JS_API_OBJECT_TYPE:
     case JS_SPECIAL_API_OBJECT_TYPE:
     case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
     case JS_GENERATOR_OBJECT_TYPE:
-    case JS_PROMISE_TYPE:
     case JS_ARGUMENTS_TYPE:
     case JS_ERROR_TYPE:
       JSObject::cast(this)->JSObjectPrint(os);
       break;
+    case JS_PROMISE_TYPE:
+      JSPromise::cast(this)->JSPromisePrint(os);
+      break;
     case JS_ARRAY_TYPE:
       JSArray::cast(this)->JSArrayPrint(os);
       break;
     case JS_REGEXP_TYPE:
       JSRegExp::cast(this)->JSRegExpPrint(os);
       break;
     case ODDBALL_TYPE:
       Oddball::cast(this)->to_string()->Print(os);
       break;
     case JS_BOUND_FUNCTION_TYPE:
@@ skipping 367 matching lines @@
   JSObjectPrintHeader(os, this, nullptr);
   JSObjectPrintBody(os, this);
 }
 
 void JSArray::JSArrayPrint(std::ostream& os) {  // NOLINT
   JSObjectPrintHeader(os, this, "JSArray");
   os << "\n - length = " << Brief(this->length());
   JSObjectPrintBody(os, this);
 }
 
+void JSPromise::JSPromisePrint(std::ostream& os) {  // NOLINT
+  JSObjectPrintHeader(os, this, "JSPromise");
+  os << "\n - status = " << JSPromise::Status(status());
+  os << "\n - result = " << Brief(result());
+  os << "\n - deferreds = " << Brief(deferred());
+  os << "\n - fulfill_reactions = " << Brief(fulfill_reactions());
+  os << "\n - reject_reactions = " << Brief(reject_reactions());
+}
 
 void JSRegExp::JSRegExpPrint(std::ostream& os) {  // NOLINT
   JSObjectPrintHeader(os, this, "JSRegExp");
   os << "\n - data = " << Brief(data());
   JSObjectPrintBody(os, this);
 }
 
 
 void Symbol::SymbolPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "Symbol");
@@ skipping 1118 matching lines @@
     printf("Not a transition array\n");
   } else {
     reinterpret_cast<i::TransitionArray*>(object)->Print();
   }
 }
 
 extern void _v8_internal_Print_StackTrace() {
   i::Isolate* isolate = i::Isolate::Current();
   isolate->PrintStack(stdout);
 }