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main_repo / deps / v8 / test / mjsunit / function-prototype.js @ 40c0f755
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// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Test that we can set function prototypes to non-object values. The
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// prototype used for instances in that case should be the initial
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// object prototype. ECMA-262 13.2.2.
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function TestNonObjectPrototype(value) { |
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function F() {}; |
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F.prototype = value; |
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var f = new F(); |
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assertEquals(value, F.prototype); |
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assertEquals(Object.prototype, f.__proto__); |
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} |
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var values = [123, "asdf", true]; |
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values.forEach(TestNonObjectPrototype); |
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// Test moving between non-object and object values.
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function F() {}; |
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var f = new F(); |
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assertEquals(f.__proto__, F.prototype); |
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F.prototype = 42;
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f = new F();
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assertEquals(Object.prototype, f.__proto__); |
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assertEquals(42, F.prototype);
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F.prototype = { a: 42 }; |
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f = new F();
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assertEquals(42, F.prototype.a);
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assertEquals(f.__proto__, F.prototype); |
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// Test that the fast case optimizations can handle non-functions,
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// functions with no prototypes (yet), non-object prototypes,
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// functions without initial maps, and the fully initialized
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// functions.
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function GetPrototypeOf(f) { |
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return f.prototype;
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}; |
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// Seed the GetPrototypeOf function to enable the fast case
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// optimizations.
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var p = GetPrototypeOf(GetPrototypeOf);
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// Check that getting the prototype of a tagged integer works.
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assertTrue(typeof GetPrototypeOf(1) == 'undefined'); |
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function NoPrototypeYet() { } |
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var p = GetPrototypeOf(NoPrototypeYet);
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assertEquals(NoPrototypeYet.prototype, p); |
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function NonObjectPrototype() { } |
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NonObjectPrototype.prototype = 42;
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assertEquals(42, GetPrototypeOf(NonObjectPrototype));
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function NoInitialMap() { } |
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var p = NoInitialMap.prototype;
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assertEquals(p, GetPrototypeOf(NoInitialMap)); |
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// Check the standard fast case.
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assertEquals(F.prototype, GetPrototypeOf(F)); |
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// Check that getting the prototype of a non-function works. This must
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// be the last thing we do because this will clobber the optimizations
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// in GetPrototypeOf and go to a monomorphic IC load instead.
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assertEquals(87, GetPrototypeOf({prototype:87})); |
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// Check the prototype is enumerable as specified in ECMA262, 15.3.5.2
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var foo = new Function("return x"); |
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var result = "" |
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for (var n in foo) result += n; |
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assertEquals(result, "prototype");
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