Expose promise value through promise mirror.

R=rossberg@chromium.org, yurys@chromium.org
BUG=v8:3093
LOG=Y

Review URL: https://codereview.chromium.org/258823012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21003 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mirror-debugger.js

@@ -1216,6 +1216,11 @@ PromiseMirror.prototype.status = function() {
 };
 
 
+PromiseMirror.prototype.promiseValue = function() {
+  return %GetPromiseValue(this.value_);
+};
+
+
 /**
  * Base mirror object for properties.
  * @param {ObjectMirror} mirror The mirror object having this property
@@ -2533,6 +2538,7 @@ JSONProtocolSerializer.prototype.serializeObject_ = function(mirror, content,
   if (mirror.isPromise()) {
     // Add promise specific properties.
     content.status = mirror.status();
+    content.promiseValue = mirror.promiseValue();
   }
 
   // Add actual properties - named properties followed by indexed properties.

test/mjsunit/es6/mirror-promises.js

@@ -17,7 +17,7 @@ MirrorRefCache.prototype.lookup = function(handle) {
   return this.refs_[handle];
 }
 
-function testPromiseMirror(promise, status) {
+function testPromiseMirror(promise, status, value) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(promise);
   var serializer = debug.MakeMirrorSerializer();
@@ -39,6 +39,7 @@ function testPromiseMirror(promise, status) {
   assertEquals("Object", mirror.className());
   assertEquals("#<Promise>", mirror.toText());
   assertSame(promise, mirror.value());
+  assertEquals(value, mirror.promiseValue());
 
   // Parse JSON representation and check.
   var fromJSON = eval('(' + json + ')');
@@ -47,7 +48,7 @@ function testPromiseMirror(promise, status) {
   assertEquals('function', refs.lookup(fromJSON.constructorFunction.ref).type);
   assertEquals('Promise', refs.lookup(fromJSON.constructorFunction.ref).name);
   assertEquals(status, fromJSON.status);
-
+  assertEquals(value, fromJSON.promiseValue);
 }
 
 // Test a number of different promises.
@@ -55,6 +56,14 @@ 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, "resolved");
-testPromiseMirror(rejected, "rejected");
-testPromiseMirror(pending, "pending");
+testPromiseMirror(resolved, "resolved", undefined);
+testPromiseMirror(rejected, "rejected", undefined);
+testPromiseMirror(pending, "pending", undefined);
+
+var resolvedv = new Promise(function(resolve, reject) { resolve('resolve') });
+var rejectedv = new Promise(function(resolve, reject) { reject('reject') });
+var thrownv = new Promise(function(resolve, reject) { throw 'throw' });
+
+testPromiseMirror(resolvedv, "resolved", 'resolve');
+testPromiseMirror(rejectedv, "rejected", 'reject');
+testPromiseMirror(thrownv, "rejected", 'throw');