1// Copyright 2009 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.
12//     * Neither the name of Google Inc. nor the names of its
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
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --allow-natives-syntax
29
30// Test the handling of initialization of deleted const variables.
31// This only makes sense in local scopes since the declaration and
32// initialization of consts in the global scope happen at the same
33// time.
34
35function testIntroduceGlobal() {
36  var source =
37      // Deleting 'x' removes the local const property.
38      "delete x;" +
39      // Initialization redefines global 'x'.
40      "const x = 3; assertEquals(3, x);" +
41      // Test constness of the global 'x'.
42      "x = 4; assertEquals(3, x);";
43  eval(source);
44}
45
46testIntroduceGlobal();
47assertEquals("undefined", typeof x);
48
49function testAssignExistingGlobal() {
50  var source =
51      // Delete 'x' to remove the local const property.
52      "delete x;" +
53      // Initialization redefines global 'x'.
54      "const x = 5; assertEquals(5, x);" +
55      // Test constness of the global 'x'.
56      "x = 6; assertEquals(5, x);";
57  eval(source);
58}
59
60testAssignExistingGlobal();
61assertEquals("undefined", typeof x);
62
63function testAssignmentArgument(x) {
64  function local() {
65    var source = "delete x; const x = 7; assertEquals(7, x)";
66    eval(source);
67  }
68  local();
69  assertEquals("undefined", typeof x);
70}
71
72for (var i = 0; i < 5; i++) {
73  testAssignmentArgument();
74}
75%OptimizeFunctionOnNextCall(testAssignmentArgument);
76testAssignmentArgument();
77assertEquals("undefined", typeof x);
78
79__defineSetter__('x', function() { throw 42; });
80var finished = false;
81function testRedefineGlobal() {
82  // Initialization redefines global 'x'.
83  var source = "delete x; const x = 8; finished = true;";
84  eval(source);
85}
86
87testRedefineGlobal();
88assertTrue(finished);
89
90function testInitFastCaseExtension() {
91  var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)";
92  eval(source);
93}
94
95testInitFastCaseExtension();
96
97function testInitSlowCaseExtension() {
98  var source = "";
99  // Introduce 100 properties on the context extension object to force
100  // it in slow case.
101  for (var i = 0; i < 100; i++) source += ("var a" + i + " = " + i + ";");
102  source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)";
103  eval(source);
104}
105
106testInitSlowCaseExtension();
107
108function testAssignSurroundingContextSlot() {
109  var x = 12;
110  function local() {
111    var source = "delete x; const x = 13; assertEquals(13, x)";
112    eval(source);
113  }
114  local();
115  assertEquals(12, x);
116}
117
118testAssignSurroundingContextSlot();
119