1 // Copyright 2008 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
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28 // Test that we can set function prototypes to non-object values. The
29 // prototype used for instances in that case should be the initial
30 // object prototype. ECMA-262 13.2.2.
31 function TestNonObjectPrototype(value) {
35 assertEquals(value, F.prototype);
36 assertEquals(Object.prototype, f.__proto__);
37 // Test that map transitions don't break anything.
39 assertEquals(value, F.prototype);
42 var values = [123, "asdf", true];
44 values.forEach(TestNonObjectPrototype);
47 // Test moving between non-object and object values.
50 assertEquals(f.__proto__, F.prototype);
53 assertEquals(Object.prototype, f.__proto__);
54 assertEquals(42, F.prototype);
55 F.prototype = { a: 42 };
57 assertEquals(42, F.prototype.a);
58 assertEquals(f.__proto__, F.prototype);
61 // Test that the fast case optimizations can handle non-functions,
62 // functions with no prototypes (yet), non-object prototypes,
63 // functions without initial maps, and the fully initialized
65 function GetPrototypeOf(f) {
69 // Seed the GetPrototypeOf function to enable the fast case
71 var p = GetPrototypeOf(GetPrototypeOf);
73 // Check that getting the prototype of a tagged integer works.
74 assertTrue(typeof GetPrototypeOf(1) == 'undefined');
76 function NoPrototypeYet() { }
77 var p = GetPrototypeOf(NoPrototypeYet);
78 assertEquals(NoPrototypeYet.prototype, p);
80 function NonObjectPrototype() { }
81 NonObjectPrototype.prototype = 42;
82 assertEquals(42, GetPrototypeOf(NonObjectPrototype));
84 function NoInitialMap() { }
85 var p = NoInitialMap.prototype;
86 assertEquals(p, GetPrototypeOf(NoInitialMap));
88 // Check the standard fast case.
89 assertEquals(F.prototype, GetPrototypeOf(F));
91 // Check that getting the prototype of a non-function works. This must
92 // be the last thing we do because this will clobber the optimizations
93 // in GetPrototypeOf and go to a monomorphic IC load instead.
94 assertEquals(87, GetPrototypeOf({prototype:87}));
96 // Check the prototype is not enumerable, as per ES5 section 15.3.5.2. Note
97 // that this is in difference to ES3, which specified that function instances
98 // would have enumerable prototypes (section 15.3.5.2 also).
99 var foo = new Function("return x");
101 for (var n in foo) result += n;
102 assertEquals(result, "");
104 f = new Function('return 1;')
105 var desc = Object.getOwnPropertyDescriptor(f, "prototype");
106 assertFalse(desc.configurable);
107 assertFalse(desc.enumerable);
108 assertTrue(desc.writable);
110 f = Function('return 1;')
111 var desc = Object.getOwnPropertyDescriptor(f, "prototype");
112 assertFalse(desc.configurable);
113 assertFalse(desc.enumerable);
114 assertTrue(desc.writable);
116 f = function () { return 1; }
117 var desc = Object.getOwnPropertyDescriptor(f, "prototype");
118 assertFalse(desc.configurable);
119 assertFalse(desc.enumerable);
120 assertTrue(desc.writable);