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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
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     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 // Flags: --harmony-scoping --allow-natives-syntax
     29 
     30 // Test instantations of generators.
     31 
     32 // Generators shouldn't allocate stack slots.  This test will abort in debug
     33 // mode if generators have stack slots.
     34 function TestContextAllocation() {
     35   function* g1(a, b, c) { yield 1; return [a, b, c]; }
     36   function* g2() { yield 1; return arguments; }
     37   function* g3() { yield 1; return this; }
     38   function* g4() { var x = 10; yield 1; return x; }
     39   // Temporary variable context allocation
     40   function* g5(l) { "use strict"; yield 1; for (let x in l) { yield x; } }
     41 
     42   g1();
     43   g2();
     44   g3();
     45   g4();
     46   g5(["foo"]);
     47 }
     48 TestContextAllocation();
     49 
     50 
     51 // Test the properties and prototype of a generator object.
     52 function TestGeneratorObject() {
     53   function* g() { yield 1; }
     54 
     55   var iter = g();
     56   assertSame(g.prototype, Object.getPrototypeOf(iter));
     57   assertTrue(iter instanceof g);
     58   assertEquals("Generator", %_ClassOf(iter));
     59   assertEquals("[object Generator]", String(iter));
     60   assertEquals([], Object.getOwnPropertyNames(iter));
     61   assertTrue(iter !== g());
     62 
     63   // g() is the same as new g().
     64   iter = new g();
     65   assertSame(g.prototype, Object.getPrototypeOf(iter));
     66   assertTrue(iter instanceof g);
     67   assertEquals("Generator", %_ClassOf(iter));
     68   assertEquals("[object Generator]", String(iter));
     69   assertEquals([], Object.getOwnPropertyNames(iter));
     70   assertTrue(iter !== new g());
     71 }
     72 TestGeneratorObject();
     73 
     74 
     75 // Test the methods of generator objects.
     76 function TestGeneratorObjectMethods() {
     77   function* g() { yield 1; }
     78   var iter = g();
     79 
     80   function TestNonGenerator(non_generator) {
     81     assertThrows(function() { iter.next.call(non_generator); }, TypeError);
     82     assertThrows(function() { iter.next.call(non_generator, 1); }, TypeError);
     83     assertThrows(function() { iter.throw.call(non_generator, 1); }, TypeError);
     84     assertThrows(function() { iter.close.call(non_generator); }, TypeError);
     85   }
     86 
     87   TestNonGenerator(1);
     88   TestNonGenerator({});
     89   TestNonGenerator(function(){});
     90   TestNonGenerator(g);
     91   TestNonGenerator(g.prototype);
     92 }
     93 TestGeneratorObjectMethods();
     94