| // Copyright 2008 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 |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // Test that we can set function prototypes to non-object values. The |
| // prototype used for instances in that case should be the initial |
| // object prototype. ECMA-262 13.2.2. |
| function TestNonObjectPrototype(value) { |
| function F() {}; |
| F.prototype = value; |
| var f = new F(); |
| assertEquals(value, F.prototype); |
| assertEquals(Object.prototype, f.__proto__); |
| // Test that map transitions don't break anything. |
| F.property = "value"; |
| assertEquals(value, F.prototype); |
| } |
| |
| var values = [123, "asdf", true]; |
| |
| values.forEach(TestNonObjectPrototype); |
| |
| |
| // Test moving between non-object and object values. |
| function F() {}; |
| var f = new F(); |
| assertEquals(f.__proto__, F.prototype); |
| F.prototype = 42; |
| f = new F(); |
| assertEquals(Object.prototype, f.__proto__); |
| assertEquals(42, F.prototype); |
| F.prototype = { a: 42 }; |
| f = new F(); |
| assertEquals(42, F.prototype.a); |
| assertEquals(f.__proto__, F.prototype); |
| |
| |
| // Test that the fast case optimizations can handle non-functions, |
| // functions with no prototypes (yet), non-object prototypes, |
| // functions without initial maps, and the fully initialized |
| // functions. |
| function GetPrototypeOf(f) { |
| return f.prototype; |
| }; |
| |
| // Seed the GetPrototypeOf function to enable the fast case |
| // optimizations. |
| var p = GetPrototypeOf(GetPrototypeOf); |
| |
| // Check that getting the prototype of a tagged integer works. |
| assertTrue(typeof GetPrototypeOf(1) == 'undefined'); |
| |
| function NoPrototypeYet() { } |
| var p = GetPrototypeOf(NoPrototypeYet); |
| assertEquals(NoPrototypeYet.prototype, p); |
| |
| function NonObjectPrototype() { } |
| NonObjectPrototype.prototype = 42; |
| assertEquals(42, GetPrototypeOf(NonObjectPrototype)); |
| |
| function NoInitialMap() { } |
| var p = NoInitialMap.prototype; |
| assertEquals(p, GetPrototypeOf(NoInitialMap)); |
| |
| // Check the standard fast case. |
| assertEquals(F.prototype, GetPrototypeOf(F)); |
| |
| // Check that getting the prototype of a non-function works. This must |
| // be the last thing we do because this will clobber the optimizations |
| // in GetPrototypeOf and go to a monomorphic IC load instead. |
| assertEquals(87, GetPrototypeOf({prototype:87})); |
| |
| // Check the prototype is not enumerable, as per ES5 section 15.3.5.2. Note |
| // that this is in difference to ES3, which specified that function instances |
| // would have enumerable prototypes (section 15.3.5.2 also). |
| var foo = new Function("return x"); |
| var result = "" |
| for (var n in foo) result += n; |
| assertEquals(result, ""); |
| |
| f = new Function('return 1;') |
| var desc = Object.getOwnPropertyDescriptor(f, "prototype"); |
| assertFalse(desc.configurable); |
| assertFalse(desc.enumerable); |
| assertTrue(desc.writable); |
| |
| f = Function('return 1;') |
| var desc = Object.getOwnPropertyDescriptor(f, "prototype"); |
| assertFalse(desc.configurable); |
| assertFalse(desc.enumerable); |
| assertTrue(desc.writable); |
| |
| f = function () { return 1; } |
| var desc = Object.getOwnPropertyDescriptor(f, "prototype"); |
| assertFalse(desc.configurable); |
| assertFalse(desc.enumerable); |
| assertTrue(desc.writable); |