Make instanceof and Object.getPrototypeOf work for proxies, plus a few other tweaks.

test/mjsunit/harmony/proxies.js

Index: test/mjsunit/harmony/proxies.js
diff --git a/test/mjsunit/harmony/proxies.js b/test/mjsunit/harmony/proxies.js
index 3edb2a0ceecc5298dc00614c6c65a5838a13233d..a23427c54a353f8c5d2284e02d4596714a2a0991 100644
--- a/test/mjsunit/harmony/proxies.js
+++ b/test/mjsunit/harmony/proxies.js
@@ -88,22 +88,22 @@ TestSet(Proxy.create({get: function(pr, pk) { return function(r, k, v) { key = k
 
 // Comparison.
 
-var o1 = Proxy.create({})
-var o2 = Proxy.create({})
-
-assertTrue(o1 == o1)
-assertTrue(o2 == o2)
-assertTrue(!(o1 == o2))
-assertTrue(!(o1 == {}))
-assertTrue(!({} == o2))
-assertTrue(!({} == {}))
+function TestComparison(eq) {
+  var o1 = Proxy.create({})
+  var o2 = Proxy.create({})
+
+  assertTrue(eq(o1, o1))
+  assertTrue(eq(o2, o2))
+  assertTrue(!eq(o1, o2))
+  assertTrue(!eq(o1, {}))
+  assertTrue(!eq({}, o2))
+  assertTrue(!eq({}, {}))
+}
 
-assertTrue(o1 === o1)
-assertTrue(o2 === o2)
-assertTrue(!(o1 === o2))
-assertTrue(!(o1 === {}))
-assertTrue(!({} === o2))
-assertTrue(!({} === {}))
+TestComparison(function(o1, o2) { return o1 == o2 })
+TestComparison(function(o1, o2) { return o1 === o2 })
+TestComparison(function(o1, o2) { return !(o1 != o2) })
+TestComparison(function(o1, o2) { return !(o1 !== o2) })
 
 
 
@@ -114,3 +114,60 @@ assertTrue(typeof Proxy.create({}) == "object")
 assertTrue("object" == typeof Proxy.create({}))
 
 // No function proxies yet.
+
+
+
+// Instanceof (instanceof).
+
+function TestInstanceof() {
+  var o = {}
+  var p1 = Proxy.create({})
+  var p2 = Proxy.create({}, o)
+  var p3 = Proxy.create({}, p2)
+
+  var f = function() {}
+  f.prototype = o
+  var f1 = function() {}
+  f1.prototype = p1
+  var f2 = function() {}
+  f2.prototype = p2
+
+  assertTrue(o instanceof Object)
+  assertFalse(o instanceof f)
+  assertFalse(o instanceof f1)
+  assertFalse(o instanceof f2)
+  assertFalse(p1 instanceof Object)
+  assertFalse(p1 instanceof f)
+  assertFalse(p1 instanceof f1)
+  assertFalse(p1 instanceof f2)
+  assertTrue(p2 instanceof Object)
+  assertTrue(p2 instanceof f)
+  assertFalse(p2 instanceof f1)
+  assertFalse(p2 instanceof f2)
+  assertTrue(p3 instanceof Object)
+  assertTrue(p3 instanceof f)
+  assertFalse(p3 instanceof f1)
+  assertTrue(p3 instanceof f2)
+}
+
+TestInstanceof()
+
+
+
+// Prototype (Object.getPrototypeOf).
+
+function TestPrototype() {
+  var o = {}
+  var p1 = Proxy.create({})
+  var p2 = Proxy.create({}, o)
+  var p3 = Proxy.create({}, p2)
+  var p4 = Proxy.create({}, 666)
+
+  assertSame(Object.getPrototypeOf(o), Object.prototype)
+  assertSame(Object.getPrototypeOf(p1), null)
+  assertSame(Object.getPrototypeOf(p2), o)
+  assertSame(Object.getPrototypeOf(p3), p2)
+  assertSame(Object.getPrototypeOf(p4), null)
+}
+
+TestPrototype()