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// 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: --allow-natives-syntax
// Test instantations of generators.
// Generators shouldn't allocate stack slots. This test will abort in debug
// mode if generators have stack slots.
function TestContextAllocation() {
function* g1(a, b, c) { yield 1; return [a, b, c]; }
function* g2() { yield 1; return arguments; }
function* g3() { yield 1; return this; }
function* g4() { var x = 10; yield 1; return x; }
// Temporary variable context allocation
function* g5(l) { "use strict"; yield 1; for (let x in l) { yield x; } }
g1();
g2();
g3();
g4();
g5(["foo"]);
}
TestContextAllocation();
// Test the properties and prototype of a generator object.
function TestGeneratorObject() {
function* g() { yield 1; }
var iter = g();
assertSame(g.prototype, Object.getPrototypeOf(iter));
assertTrue(iter instanceof g);
assertEquals("[object Generator]", String(iter));
assertEquals([], Object.getOwnPropertyNames(iter));
assertTrue(iter !== g());
assertEquals("[object Generator]", Object.prototype.toString.call(iter));
var gf = iter.__proto__.constructor;
assertEquals("[object GeneratorFunction]", Object.prototype.toString.call(gf));
// generators are not constructable.
assertThrows(()=>new g());
}
TestGeneratorObject();
// Test the methods of generator objects.
function TestGeneratorObjectMethods() {
function* g() { yield 1; }
var iter = g();
function TestNonGenerator(non_generator) {
assertThrows(function() { iter.next.call(non_generator); }, TypeError);
assertThrows(function() { iter.next.call(non_generator, 1); }, TypeError);
assertThrows(function() { iter.throw.call(non_generator, 1); }, TypeError);
}
TestNonGenerator(1);
TestNonGenerator({});
TestNonGenerator(function(){});
TestNonGenerator(g);
TestNonGenerator(g.prototype);
}
TestGeneratorObjectMethods();
function TestPrototype() {
function* g() { }
let g_prototype = g.prototype;
assertEquals([], Reflect.ownKeys(g_prototype));
let generator_prototype = Object.getPrototypeOf(g_prototype);
assertSame(generator_prototype, Object.getPrototypeOf(g).prototype);
// Unchanged .prototype
assertSame(g_prototype, Object.getPrototypeOf(g()));
// Custom object as .prototype
{
let proto = {};
g.prototype = proto;
assertSame(proto, Object.getPrototypeOf(g()));
}
// Custom non-object as .prototype
g.prototype = null;
assertSame(generator_prototype, Object.getPrototypeOf(g()));
}
TestPrototype();
function TestComputedPropertyNames() {
function* f1() { return {[yield]: 42} }
var g1 = f1();
g1.next();
assertEquals(42, g1.next('a').value.a);
function* f2() { return {['a']: yield} }
var g2 = f2();
g2.next();
assertEquals(42, g2.next(42).value.a);
}
TestComputedPropertyNames();
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