Expose promise status through promise mirror.

test/mjsunit/es6/mirror-promises.js

+// Copyright 2014 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.
+
+// Flags: --expose-debug-as debug --harmony-promises
+// Test the mirror object for promises.
+
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
+function testPromiseMirror(promise, status) {
+  // Create mirror and JSON representation.
+  var mirror = debug.MakeMirror(promise);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = JSON.stringify(serializer.serializeValue(mirror));
+  var refs = new MirrorRefCache(
+      JSON.stringify(serializer.serializeReferencedObjects()));
+
+  // Check the mirror hierachy.
+  assertTrue(mirror instanceof debug.Mirror);
+  assertTrue(mirror instanceof debug.ValueMirror);
+  assertTrue(mirror instanceof debug.ObjectMirror);
+  assertTrue(mirror instanceof debug.PromiseMirror);
+
+  // Check the mirror properties.
+  assertEquals(status, mirror.status());
+  assertTrue(mirror.isPromise());
+  assertEquals('promise', mirror.type());
+  assertFalse(mirror.isPrimitive());
+  assertEquals("Object", mirror.className());
+  assertEquals("#<Promise>", mirror.toText());
+
+  // Parse JSON representation and check.
+  var fromJSON = eval('(' + json + ')');
+  assertEquals('promise', fromJSON.type);
+  assertEquals('Object', fromJSON.className);
+  assertEquals('function', refs.lookup(fromJSON.constructorFunction.ref).type);
+  assertEquals('Promise', refs.lookup(fromJSON.constructorFunction.ref).name);
+  assertEquals(status, fromJSON.status);
+
+}
+
+// Test a number of different promises.
+var resolved = new Promise(function(resolve, reject) { resolve() });
+var rejected = new Promise(function(resolve, reject) { reject() });
+var pending = new Promise(function(resolve, reject) {});
+
+testPromiseMirror(resolved, debug.PromiseMirror.Resolved);
+testPromiseMirror(rejected, debug.PromiseMirror.Rejected);
+testPromiseMirror(pending, debug.PromiseMirror.Pending);