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// 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);
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