1// Copyright 2013 the V8 project authors. All rights reserved.
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3// modification, are permitted provided that the following conditions are
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5//
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27
28// Flags: --allow-natives-syntax --store-elimination
29
30// Test local elimination of unobservable stores.
31
32function B(x, y) {
33  this.x = x;
34  this.y = y;
35  return this;
36}
37
38function test_store_store() {
39  var a = new B(1, 2);
40  a.x = 3;  // eliminatable.
41  a.x = 4;
42  return a.x;
43}
44
45function test_store_load_store1() {
46  var a = new B(6, 7);
47  a.x = 3;  // eliminatable.
48  var r = a.y;
49  a.x = 4;
50  return r;
51}
52
53function test_store_load_store2() {
54  var a = new B(6, 8);
55  a.x = 3;  // not eliminatable, unless next load is eliminated.
56  var r = a.x;
57  a.x = 4;
58  return r;
59}
60
61function test_store_call_store() {
62  var a = new B(2, 9);
63  a.x = 3;  // not eliminatable.
64  killall();
65  a.x = 4;
66  return a.y;
67}
68
69function test_store_deopt_store() {
70  var a = new B(2, 1);
71  a.x = 3;  // not eliminatable (implicit ValueOf following)
72  var c = a + 2;
73  a.x = 4;
74  return a.y;
75}
76
77function killall() {
78  try { } catch(e) { }
79}
80
81%NeverOptimizeFunction(killall);
82
83function test(x, f) {
84  assertEquals(x, f());
85  assertEquals(x, f());
86  %OptimizeFunctionOnNextCall(f);
87  assertEquals(x, f());
88}
89
90test(4, test_store_store);
91test(7, test_store_load_store1);
92test(3, test_store_load_store2);
93test(9, test_store_call_store);
94test(1, test_store_deopt_store);
95