Reimplement Function.prototype.bind.

test/mjsunit/harmony/proxies-function.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 20 matching lines @@
 // Helper.
 
 function CreateFrozen(handler, callTrap, constructTrap) {
   if (handler.fix === undefined) handler.fix = function() { return {} }
   var f = Proxy.createFunction(handler, callTrap, constructTrap)
   Object.freeze(f)
   return f
 }
 
 
+// Ensures that checking the "length" property of a function proxy doesn't
+// crash due to lack of a [[Get]] method.
+var handler = {
+  get : function(r, n) { return n == "length" ? 2 : undefined }
+}
+
+
 // Calling (call, Function.prototype.call, Function.prototype.apply,
 //          Function.prototype.bind).
 
 var global_object = this
 var receiver
 
 function TestCall(isStrict, callTrap) {
   assertEquals(42, callTrap(5, 37))
   assertEquals(isStrict ? undefined : global_object, receiver)
 
@@ skipping 87 matching lines @@
   assertSame(o, receiver)
   receiver = 333
   assertEquals(42, ff(30))
   assertSame(o, receiver)
   receiver = 333
   assertEquals(32, Function.prototype.apply.call(ff, {}, [20]))
   assertSame(o, receiver)
 }
 
 TestCall(false, function(x, y) {
-  receiver = this; return x + y
+  receiver = this
+  return x + y
 })
 
 TestCall(true, function(x, y) {
-  "use strict";
-  receiver = this; return x + y
+  "use strict"
+  receiver = this
+  return x + y
 })
 
 TestCall(false, function() {
   receiver = this; return arguments[0] + arguments[1]
 })
 
-TestCall(false, Proxy.createFunction({}, function(x, y) {
-  receiver = this; return x + y
+TestCall(false, Proxy.createFunction(handler, function(x, y) {
+  receiver = this
+  return x + y
 }))
 
-TestCall(true, Proxy.createFunction({}, function(x, y) {
-  "use strict";
-  receiver = this; return x + y
+TestCall(true, Proxy.createFunction(handler, function(x, y) {
+  "use strict"
+  receiver = this
+  return x + y
 }))
 
-TestCall(false, CreateFrozen({}, function(x, y) {
-  receiver = this; return x + y
+TestCall(false, CreateFrozen(handler, function(x, y) {
+  receiver = this
+  return x + y
 }))
 
 
 
 // Using intrinsics as call traps.
 
 function TestCallIntrinsic(type, callTrap) {
   var f = Proxy.createFunction({}, callTrap)
   var x = f()
   assertTrue(typeof x == type)
@@ skipping 30 matching lines @@
 TestCallThrow(CreateFrozen({}, function() { throw "myexn" }))
 
 
 
 // Construction (new).
 
 var prototype = {}
 var receiver
 
 var handlerWithPrototype = {
-  fix: function() { return {prototype: prototype} },
-  get: function(r, n) { assertEquals("prototype", n); return prototype }
+  fix: function() { return { prototype: { value: prototype } }; },
+  get: function(r, n) {
+    if (n == "length") return 2;
+    assertEquals("prototype", n);
+    return prototype;
+  }
 }
 
 var handlerSansPrototype = {
-  fix: function() { return {} },
-  get: function(r, n) { assertEquals("prototype", n); return undefined }
+  fix: function() { return { length: { value: 2 } } },
+  get: function(r, n) {
+    if (n == "length") return 2;
+    assertEquals("prototype", n);
+    return undefined;
+  }
 }
 
-function ReturnUndef(x, y) { "use strict"; receiver = this; this.sum = x + y }
-function ReturnThis(x, y) { "use strict"; receiver = this; this.sum = x + y; return this }
-function ReturnNew(x, y) { "use strict"; receiver = this; return {sum: x + y} }
+function ReturnUndef(x, y) {
+  "use strict";
+  receiver = this;
+  this.sum = x + y;
+}
+
+function ReturnThis(x, y) {
+  "use strict";
+  receiver = this;
+  this.sum = x + y;
+  return this;
+}
+
+function ReturnNew(x, y) {
+  "use strict";
+  receiver = this;
+  return {sum: x + y};
+}
+
 function ReturnNewWithProto(x, y) {
   "use strict";
   receiver = this;
-  var result = Object.create(prototype)
-  result.sum = x + y
-  return result
+  var result = Object.create(prototype);
+  result.sum = x + y;
+  return result;
 }
 
 function TestConstruct(proto, constructTrap) {
   TestConstruct2(proto, constructTrap, handlerWithPrototype)
   TestConstruct2(proto, constructTrap, handlerSansPrototype)
 }
 
 function TestConstruct2(proto, constructTrap, handler) {
   var f = Proxy.createFunction(handler, function() {}, constructTrap)
   var o = new f(11, 31)
@@ skipping 17 matching lines @@
   var ff = Function.prototype.bind.call(f, o, 10)
   var o = new ff(32)
   assertEquals(undefined, receiver)
   assertEquals(42, o.sum)
   assertSame(proto, Object.getPrototypeOf(o))
 }
 
 TestConstruct(Object.prototype, ReturnNew)
 TestConstruct(prototype, ReturnNewWithProto)
 
-TestConstruct(Object.prototype, Proxy.createFunction({}, ReturnNew))
-TestConstruct(prototype, Proxy.createFunction({}, ReturnNewWithProto))
+TestConstruct(Object.prototype, Proxy.createFunction(handler, ReturnNew))
+TestConstruct(prototype, Proxy.createFunction(handler, ReturnNewWithProto))
 
-TestConstruct(Object.prototype, CreateFrozen({}, ReturnNew))
-TestConstruct(prototype, CreateFrozen({}, ReturnNewWithProto))
+TestConstruct(Object.prototype, CreateFrozen(handler, ReturnNew))
+TestConstruct(prototype, CreateFrozen(handler, ReturnNewWithProto))
 
 
 
 // Construction with derived construct trap.
 
 function TestConstructFromCall(proto, returnsThis, callTrap) {
   TestConstructFromCall2(proto, returnsThis, callTrap, handlerWithPrototype)
   TestConstructFromCall2(proto, returnsThis, callTrap, handlerSansPrototype)
 }
 
@@ skipping 23 matching lines @@
 //  assertEquals(undefined, receiver)
 //  assertEquals(42, o.sum)
 //  assertSame(proto, Object.getPrototypeOf(o))
 }
 
 TestConstructFromCall(Object.prototype, true, ReturnUndef)
 TestConstructFromCall(Object.prototype, true, ReturnThis)
 TestConstructFromCall(Object.prototype, false, ReturnNew)
 TestConstructFromCall(prototype, false, ReturnNewWithProto)
 
-TestConstructFromCall(Object.prototype, true, Proxy.createFunction({}, ReturnUndef))
-TestConstructFromCall(Object.prototype, true, Proxy.createFunction({}, ReturnThis))
-TestConstructFromCall(Object.prototype, false, Proxy.createFunction({}, ReturnNew))
-TestConstructFromCall(prototype, false, Proxy.createFunction({}, ReturnNewWithProto))
+TestConstructFromCall(Object.prototype, true,
+                      Proxy.createFunction(handler, ReturnUndef))
+TestConstructFromCall(Object.prototype, true,
+                      Proxy.createFunction(handler, ReturnThis))
+TestConstructFromCall(Object.prototype, false,
+                      Proxy.createFunction(handler, ReturnNew))
+TestConstructFromCall(prototype, false,
+                      Proxy.createFunction(handler, ReturnNewWithProto))
 
 TestConstructFromCall(Object.prototype, true, CreateFrozen({}, ReturnUndef))
 TestConstructFromCall(Object.prototype, true, CreateFrozen({}, ReturnThis))
 TestConstructFromCall(Object.prototype, false, CreateFrozen({}, ReturnNew))
 TestConstructFromCall(prototype, false, CreateFrozen({}, ReturnNewWithProto))
 
 ReturnUndef.prototype = prototype
 ReturnThis.prototype = prototype
 ReturnNew.prototype = prototype
 ReturnNewWithProto.prototype = prototype
 
 TestConstructFromCall(prototype, true, ReturnUndef)
 TestConstructFromCall(prototype, true, ReturnThis)
 TestConstructFromCall(Object.prototype, false, ReturnNew)
 TestConstructFromCall(prototype, false, ReturnNewWithProto)
 
-TestConstructFromCall(Object.prototype, true, Proxy.createFunction({}, ReturnUndef))
-TestConstructFromCall(Object.prototype, true, Proxy.createFunction({}, ReturnThis))
-TestConstructFromCall(Object.prototype, false, Proxy.createFunction({}, ReturnNew))
-TestConstructFromCall(prototype, false, Proxy.createFunction({}, ReturnNewWithProto))
+TestConstructFromCall(Object.prototype, true,
+                      Proxy.createFunction(handler, ReturnUndef))
+TestConstructFromCall(Object.prototype, true,
+                      Proxy.createFunction(handler, ReturnThis))
+TestConstructFromCall(Object.prototype, false,
+                      Proxy.createFunction(handler, ReturnNew))
+TestConstructFromCall(prototype, false,
+                      Proxy.createFunction(handler, ReturnNewWithProto))
 
-TestConstructFromCall(prototype, true, Proxy.createFunction(handlerWithPrototype, ReturnUndef))
-TestConstructFromCall(prototype, true, Proxy.createFunction(handlerWithPrototype, ReturnThis))
-TestConstructFromCall(Object.prototype, false, Proxy.createFunction(handlerWithPrototype, ReturnNew))
-TestConstructFromCall(prototype, false, Proxy.createFunction(handlerWithPrototype, ReturnNewWithProto))
+TestConstructFromCall(prototype, true,
+                      Proxy.createFunction(handlerWithPrototype, ReturnUndef))
+TestConstructFromCall(prototype, true,
+                      Proxy.createFunction(handlerWithPrototype, ReturnThis))
+TestConstructFromCall(Object.prototype, false,
+                      Proxy.createFunction(handlerWithPrototype, ReturnNew))
+TestConstructFromCall(prototype, false,
+                      Proxy.createFunction(handlerWithPrototype,
+                                           ReturnNewWithProto))
 
-TestConstructFromCall(prototype, true, CreateFrozen(handlerWithPrototype, ReturnUndef))
-TestConstructFromCall(prototype, true, CreateFrozen(handlerWithPrototype, ReturnThis))
-TestConstructFromCall(Object.prototype, false, CreateFrozen(handlerWithPrototype, ReturnNew))
-TestConstructFromCall(prototype, false, CreateFrozen(handlerWithPrototype, ReturnNewWithProto))
+TestConstructFromCall(prototype, true,
+                      CreateFrozen(handlerWithPrototype, ReturnUndef))
+TestConstructFromCall(prototype, true,
+                      CreateFrozen(handlerWithPrototype, ReturnThis))
+TestConstructFromCall(Object.prototype, false,
+                      CreateFrozen(handlerWithPrototype, ReturnNew))
+TestConstructFromCall(prototype, false,
+                      CreateFrozen(handlerWithPrototype, ReturnNewWithProto))
 
 
 
 // Throwing from the construct trap.
 
 function TestConstructThrow(trap) {
-  TestConstructThrow2(Proxy.createFunction({fix: function() {return {}}}, trap))
-  TestConstructThrow2(Proxy.createFunction({fix: function() {return {}}},
-    function() {}, trap))
+  TestConstructThrow2(Proxy.createFunction({ fix: function() {return {};} },
+                                           trap))
+  TestConstructThrow2(Proxy.createFunction({ fix: function() {return {};} },
+                                           function() {},
+                                           trap))
 }
 
 function TestConstructThrow2(f) {
   assertThrows(function(){ new f(11) }, "myexn")
   Object.freeze(f)
   assertThrows(function(){ new f(11) }, "myexn")
 }
 
 TestConstructThrow(function() { throw "myexn" })
 TestConstructThrow(Proxy.createFunction({}, function() { throw "myexn" }))
 TestConstructThrow(CreateFrozen({}, function() { throw "myexn" }))
 
 
 
 // Using function proxies as getters and setters.
 
 var value
 var receiver
 
 function TestAccessorCall(getterCallTrap, setterCallTrap) {
-  var handler = {fix: function() { return {} }}
+  var handler = { fix: function() { return {} } }
   var pgetter = Proxy.createFunction(handler, getterCallTrap)
   var psetter = Proxy.createFunction(handler, setterCallTrap)
 
   var o = {}
   var oo = Object.create(o)
   Object.defineProperty(o, "a", {get: pgetter, set: psetter})
   Object.defineProperty(o, "b", {get: pgetter})
   Object.defineProperty(o, "c", {set: psetter})
   Object.defineProperty(o, "3", {get: pgetter, set: psetter})
   Object.defineProperty(oo, "a", {value: 43})
@@ skipping 87 matching lines @@
 
 TestAccessorCall(
   Proxy.createFunction({}, function() { receiver = this; return 42 }),
   Proxy.createFunction({}, function(x) { receiver = this; value = x })
 )
 
 TestAccessorCall(
   CreateFrozen({}, function() { receiver = this; return 42 }),
   CreateFrozen({}, function(x) { receiver = this; value = x })
 )