1 files changed, 285 insertions, 0 deletions
diff --git a/js/src/tests/non262/Proxy/getPrototypeOf.js b/js/src/tests/non262/Proxy/getPrototypeOf.js
new file mode 100644
index 0000000000..a0676c0c91
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+++ b/js/src/tests/non262/Proxy/getPrototypeOf.js
@@ -0,0 +1,285 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var gTestfile = "getPrototypeOf.js";
+var BUGNUMBER = 888969;
+var summary = "Scripted proxies' [[GetPrototypeOf]] behavior";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+const log = [];
+
+function observe(obj)
+{
+  var observingHandler = new Proxy({}, {
+    get(target, p, receiver) {
+      log.push(p);
+      return Reflect.get(target, p, receiver);
+    }
+  });
+
+  return new Proxy(obj, observingHandler);
+}
+
+function nop() {}
+
+var p, h;
+
+// 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.
+// 2. If handler is null, throw a TypeError exception.
+// 3. Assert: Type(handler) is Object.
+var rev = Proxy.revocable({}, {});
+p = rev.proxy;
+
+assertEq(Object.getPrototypeOf(p), Object.prototype);
+rev.revoke();
+assertThrowsInstanceOf(() => Object.getPrototypeOf(p), TypeError);
+
+// 4. Let target be the value of the [[ProxyTarget]] internal slot of O.
+// 5. Let trap be ? GetMethod(handler, "getPrototypeOf").
+
+// Getting handler.getPrototypeOf might throw.
+assertThrowsValue(() => Object.getPrototypeOf(new Proxy({},
+                                                        { get getPrototypeOf() {
+                                                            throw 17;
+                                                          } })),
+                  17);
+
+// The handler's getPrototypeOf, once gotten, might throw.
+p = new Proxy({}, { getPrototypeOf() { throw 42; } });
+
+assertThrowsValue(() => Object.getPrototypeOf(p), 42);
+
+// The trap might not be callable.
+p = new Proxy({}, { getPrototypeOf: 17 });
+
+assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                       TypeError);
+
+// 6. If trap is undefined, then
+//    a. Return ? target.[[GetPrototypeOf]]().
+
+var x, tp;
+
+tp =
+  new Proxy(new Number(8675309), // behavior overridden by getPrototypeOf
+            { getPrototypeOf() { x = "getPrototypeOf trap"; return null; } });
+
+// The target's [[GetPrototypeOf]] should be invoked if the handler's
+// .getPrototypeOf is undefined.
+p = new Proxy(tp, { getPrototypeOf: undefined });
+x = "unset";
+assertEq(Object.getPrototypeOf(p), null);
+assertEq(x, "getPrototypeOf trap");
+
+// Likewise if the handler's .getPrototypeOf is null.
+p = new Proxy(tp, { getPrototypeOf: null });
+x = "unset";
+assertEq(Object.getPrototypeOf(p), null);
+assertEq(x, "getPrototypeOf trap");
+
+// Now the target is an empty object with a Number object as its [[Prototype]].
+var customProto = new Number(8675309);
+tp =
+  new Proxy({},
+            { getPrototypeOf() {
+                x = "getPrototypeOf trap";
+                return customProto;
+              } });
+
+// The target's [[GetPrototypeOf]] should be invoked if the handler's
+// .getPrototypeOf is undefined.
+p = new Proxy(tp, { getPrototypeOf: undefined });
+x = "unset";
+assertEq(Object.getPrototypeOf(p), customProto);
+assertEq(x, "getPrototypeOf trap");
+
+// Likewise if the handler's .getPrototypeOf is null.
+p = new Proxy(tp, { getPrototypeOf: null });
+x = "unset";
+assertEq(Object.getPrototypeOf(p), customProto);
+assertEq(x, "getPrototypeOf trap");
+
+// 7. Let handlerProto be ? Call(trap, handler, « target »).
+
+// The trap callable might throw.
+p = new Proxy({}, { getPrototypeOf() { throw "ohai"; } });
+
+assertThrowsValue(() => Object.getPrototypeOf(p),
+                  "ohai");
+
+var throwingTrap =
+  new Proxy(function() { throw "not called"; },
+            { apply() { throw 37; } });
+
+p = new Proxy({}, { getPrototypeOf: throwingTrap });
+
+assertThrowsValue(() => Object.getPrototypeOf(p),
+                  37);
+
+// The trap callable must *only* be called.
+p = new Proxy({},
+              {
+                getPrototypeOf: observe(function() { throw "boo-urns"; })
+              });
+
+log.length = 0;
+assertThrowsValue(() => Object.getPrototypeOf(p),
+                  "boo-urns");
+
+assertEq(log.length, 1);
+assertEq(log[0], "apply");
+
+// 8. If Type(handlerProto) is neither Object nor Null, throw a TypeError exception.
+
+var rval;
+
+var typeTestingTarget = {};
+p = new Proxy(typeTestingTarget, { getPrototypeOf() { return rval; } });
+
+function returnsPrimitives()
+{
+  rval = undefined;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = true;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = false;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = 0.0;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = -0.0;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = 3.141592654;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = NaN;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = -Infinity;
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = "[[Prototype]] FOR REALZ";
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+
+  rval = Symbol("[[Prototype]] FOR REALZ");
+  assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                         TypeError);
+}
+
+returnsPrimitives();
+Object.preventExtensions(typeTestingTarget);
+returnsPrimitives();
+
+// 9. Let extensibleTarget be ? IsExtensible(target).
+
+var act, extens;
+
+var typeTestingProxyTarget =
+  new Proxy({}, { isExtensible() {
+                    seen = act();
+                    return extens;
+                  } });
+
+p = new Proxy(typeTestingProxyTarget, { getPrototypeOf() { return rval; } });
+
+rval = null;
+act = () => { throw "fnord" };
+assertThrowsValue(() => Object.getPrototypeOf(p),
+                  "fnord");
+
+rval = /abc/;
+act = () => { throw "fnord again" };
+assertThrowsValue(() => Object.getPrototypeOf(p),
+                  "fnord again");
+
+rval = Object.prototype;
+act = () => { throw "fnord" };
+assertThrowsValue(() => Object.getPrototypeOf(p),
+                  "fnord");
+
+// 10. If extensibleTarget is true, return handlerProto.
+
+p = new Proxy({}, { getPrototypeOf() { return rval; } });
+
+rval = Number.prototype;
+assertEq(Object.getPrototypeOf(p), Number.prototype);
+
+// 11. Let targetProto be ? target.[[GetPrototypeOf]]().
+
+var targetProto;
+
+var targetWithProto =
+  new Proxy(Object.preventExtensions(Object.create(null)),
+            { getPrototypeOf() { act2(); return targetProto; } });
+
+p = new Proxy(targetWithProto,
+              { getPrototypeOf() { act1(); return rval; } });
+
+rval = null;
+targetProto = null;
+
+var regex = /targetProto/;
+
+act1 = () => log.push("act1");
+act2 = () => log.push("act2");
+
+log.length = 0;
+assertEq(Object.getPrototypeOf(p), null);
+assertEq(log.length, 2);
+assertEq(log[0], "act1");
+assertEq(log[1], "act2");
+
+act1 = () => log.push("act1 again");
+act2 = () => { throw "target throw"; };
+
+log.length = 0;
+assertThrowsValue(() => Object.getPrototypeOf(p),
+                  "target throw");
+assertEq(log.length, 1);
+assertEq(log[0], "act1 again");
+
+// 12. If SameValue(handlerProto, targetProto) is false, throw a TypeError exception.
+
+act1 = act2 = nop;
+rval = /a/;
+assertThrowsInstanceOf(() => Object.getPrototypeOf(p),
+                       TypeError);
+
+// 13. Return handlerProto.
+
+rval = null;
+targetProto = null;
+
+assertEq(Object.getPrototypeOf(p), null);
+
+p = new Proxy(Object.preventExtensions(new Number(55)),
+              { getPrototypeOf() { return Number.prototype; } });
+
+assertEq(Object.getPrototypeOf(p), Number.prototype);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");