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sourceRevisionAtLastExport: 33f2fb0e53d135f0ee17cfccd9d993eb2a6f47de targetRevisionAtLastExport: 31340cbd9add103f586d501b0c3354b7b182abc0
90 lines
4.2 KiB
JavaScript
90 lines
4.2 KiB
JavaScript
// Copyright 2011 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 redefining the 'prototype' property of a function object
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// does actually set the internal value and does not screw up any
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// shadowing between said property and the internal value.
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var f = function() {};
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// Verify that normal assignment of 'prototype' property works properly
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// and updates the internal value.
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var a = { foo: 'bar' };
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f.prototype = a;
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assertSame(f.prototype, a);
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assertSame(f.prototype.foo, 'bar');
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assertSame(new f().foo, 'bar');
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assertSame(Object.getPrototypeOf(new f()), a);
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assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, a);
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assertTrue(Object.getOwnPropertyDescriptor(f, 'prototype').writable);
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// Verify that 'prototype' behaves like a data property when it comes to
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// redefining with Object.defineProperty() and the internal value gets
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// updated.
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var b = { foo: 'baz' };
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Object.defineProperty(f, 'prototype', { value: b, writable: true });
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assertSame(f.prototype, b);
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assertSame(f.prototype.foo, 'baz');
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assertSame(new f().foo, 'baz');
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assertSame(Object.getPrototypeOf(new f()), b);
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assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, b);
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assertTrue(Object.getOwnPropertyDescriptor(f, 'prototype').writable);
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// Verify that the previous redefinition didn't screw up callbacks and
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// the internal value still gets updated.
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var c = { foo: 'other' };
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f.prototype = c;
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assertSame(f.prototype, c);
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assertSame(f.prototype.foo, 'other');
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assertSame(new f().foo, 'other');
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assertSame(Object.getPrototypeOf(new f()), c);
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assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, c);
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assertTrue(Object.getOwnPropertyDescriptor(f, 'prototype').writable);
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// Verify that 'prototype' can be redefined to contain a different value
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// and have a different writability attribute at the same time.
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var d = { foo: 'final' };
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Object.defineProperty(f, 'prototype', { value: d, writable: false });
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assertSame(f.prototype, d);
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assertSame(f.prototype.foo, 'final');
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assertSame(new f().foo, 'final');
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assertSame(Object.getPrototypeOf(new f()), d);
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assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, d);
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assertFalse(Object.getOwnPropertyDescriptor(f, 'prototype').writable);
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// Verify that non-writability of redefined 'prototype' is respected.
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assertThrows("'use strict'; f.prototype = {}");
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assertThrows("Object.defineProperty(f, 'prototype', { value: {} })");
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// Verify that non-configurability of other properties is respected, but
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// non-writability is ignored by Object.defineProperty().
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// name and length are configurable in ES6
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Object.defineProperty(f, 'name', { value: {} });
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Object.defineProperty(f, 'length', { value: {} });
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assertThrows("Object.defineProperty(f, 'caller', { value: {} })");
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assertThrows("Object.defineProperty(f, 'arguments', { value: {} })");
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