| // Copyright 2013 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. |
| |
| // Flags: --harmony-generators |
| |
| // Test aspects of the generator runtime. |
| |
| // FIXME(wingo): Replace this reference with a more official link. |
| // See: |
| // http://wiki.ecmascript.org/lib/exe/fetch.php?cache=cache&media=harmony:es6_generator_object_model_3-29-13.png |
| |
| function f() { } |
| function* g() { yield 1; } |
| var GeneratorFunctionPrototype = Object.getPrototypeOf(g); |
| var GeneratorFunction = GeneratorFunctionPrototype.constructor; |
| var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype; |
| |
| // A generator function should have the same set of properties as any |
| // other function. |
| function TestGeneratorFunctionInstance() { |
| var f_own_property_names = Object.getOwnPropertyNames(f); |
| var g_own_property_names = Object.getOwnPropertyNames(g); |
| |
| f_own_property_names.sort(); |
| g_own_property_names.sort(); |
| |
| assertArrayEquals(f_own_property_names, g_own_property_names); |
| var i; |
| for (i = 0; i < f_own_property_names.length; i++) { |
| var prop = f_own_property_names[i]; |
| var f_desc = Object.getOwnPropertyDescriptor(f, prop); |
| var g_desc = Object.getOwnPropertyDescriptor(g, prop); |
| assertEquals(f_desc.configurable, g_desc.configurable, prop); |
| assertEquals(f_desc.writable, g_desc.writable, prop); |
| assertEquals(f_desc.enumerable, g_desc.enumerable, prop); |
| } |
| } |
| TestGeneratorFunctionInstance(); |
| |
| |
| // Generators have an additional object interposed in the chain between |
| // themselves and Function.prototype. |
| function TestGeneratorFunctionPrototype() { |
| // Sanity check. |
| assertSame(Object.getPrototypeOf(f), Function.prototype); |
| assertFalse(GeneratorFunctionPrototype === Function.prototype); |
| assertSame(Function.prototype, |
| Object.getPrototypeOf(GeneratorFunctionPrototype)); |
| assertSame(GeneratorFunctionPrototype, |
| Object.getPrototypeOf(function* () {})); |
| } |
| TestGeneratorFunctionPrototype(); |
| |
| |
| // Functions that we associate with generator objects are actually defined by |
| // a common prototype. |
| function TestGeneratorObjectPrototype() { |
| assertSame(Object.prototype, |
| Object.getPrototypeOf(GeneratorObjectPrototype)); |
| assertSame(GeneratorObjectPrototype, |
| Object.getPrototypeOf((function*(){yield 1}).prototype)); |
| |
| var expected_property_names = ["next", "send", "throw", "constructor"]; |
| var found_property_names = |
| Object.getOwnPropertyNames(GeneratorObjectPrototype); |
| |
| expected_property_names.sort(); |
| found_property_names.sort(); |
| |
| assertArrayEquals(expected_property_names, found_property_names); |
| } |
| TestGeneratorObjectPrototype(); |
| |
| |
| // This tests the object that would be called "GeneratorFunction", if it were |
| // like "Function". |
| function TestGeneratorFunction() { |
| assertSame(GeneratorFunctionPrototype, GeneratorFunction.prototype); |
| assertTrue(g instanceof GeneratorFunction); |
| |
| assertSame(Function, Object.getPrototypeOf(GeneratorFunction)); |
| assertTrue(g instanceof Function); |
| |
| assertEquals("function* g() { yield 1; }", g.toString()); |
| |
| // Not all functions are generators. |
| assertTrue(f instanceof Function); // Sanity check. |
| assertTrue(!(f instanceof GeneratorFunction)); |
| } |
| TestGeneratorFunction(); |
| |
| |
| function TestPerGeneratorPrototype() { |
| assertTrue((function*(){}).prototype !== (function*(){}).prototype); |
| assertTrue((function*(){}).prototype !== g.prototype); |
| assertTrue(g.prototype instanceof GeneratorFunctionPrototype); |
| assertSame(GeneratorObjectPrototype, Object.getPrototypeOf(g.prototype)); |
| assertTrue(!(g.prototype instanceof Function)); |
| assertSame(typeof (g.prototype), "object"); |
| |
| assertArrayEquals([], Object.getOwnPropertyNames(g.prototype)); |
| } |
| TestPerGeneratorPrototype(); |