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      1 // Copyright 2014 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Flags: --allow-natives-syntax
      6 
      7 function test(mode) {
      8   var a = [];
      9   Object.defineProperty(a, "length", { writable : false});
     10 
     11   function check(f) {
     12     try {
     13       f(a);
     14     } catch(e) { }
     15     assertFalse(0 in a);
     16     assertEquals(0, a.length);
     17   }
     18 
     19   function push(a) {
     20     a.push(3);
     21   }
     22 
     23   if (mode == "fast properties") %ToFastProperties(a);
     24 
     25   check(push);
     26   check(push);
     27   check(push);
     28   %OptimizeFunctionOnNextCall(push);
     29   check(push);
     30 
     31   function unshift(a) {
     32     a.unshift(3);
     33   }
     34 
     35   check(unshift);
     36   check(unshift);
     37   check(unshift);
     38   %OptimizeFunctionOnNextCall(unshift);
     39   check(unshift);
     40 }
     41 
     42 test("fast properties");
     43 
     44 test("normalized");
     45 
     46 var b = [];
     47 Object.defineProperty(b.__proto__, "0", {
     48   set : function(v) {
     49     b.x = v;
     50     Object.defineProperty(b, "length", { writable : false });
     51   },
     52   get: function() {
     53     return b.x;
     54   }
     55 });
     56 
     57 b = [];
     58 try {
     59   b.push(3, 4, 5);
     60 } catch(e) { }
     61 assertFalse(1 in b);
     62 assertFalse(2 in b);
     63 assertEquals(0, b.length);
     64 
     65 b = [];
     66 try {
     67   b.unshift(3, 4, 5);
     68 } catch(e) { }
     69 assertFalse(1 in b);
     70 assertFalse(2 in b);
     71 assertEquals(0, b.length);
     72 
     73 b = [1, 2];
     74 try {
     75   b.unshift(3, 4, 5);
     76 } catch(e) { }
     77 assertEquals(3, b[0]);
     78 assertEquals(4, b[1]);
     79 assertEquals(5, b[2]);
     80 assertEquals(1, b[3]);
     81 assertEquals(2, b[4]);
     82 assertEquals(5, b.length);
     83 
     84 b = [1, 2];
     85 
     86 Object.defineProperty(b.__proto__, "4", {
     87   set : function(v) {
     88     b.z = v;
     89     Object.defineProperty(b, "length", { writable : false });
     90   },
     91   get: function() {
     92     return b.z;
     93   }
     94 });
     95 
     96 try {
     97   b.unshift(3, 4, 5);
     98 } catch(e) { }
     99 
    100 // TODO(ulan): According to the ECMA-262 unshift should throw an exception
    101 // when moving b[0] to b[3] (see 15.4.4.13 step 6.d.ii). This is difficult
    102 // to do with our current implementation of SmartMove() in src/array.js and
    103 // it will regress performance. Uncomment the following line once acceptable
    104 // solution is found:
    105 // assertFalse(2 in b);
    106 // assertFalse(3 in b);
    107 // assertEquals(2, b.length);
    108