1 // Copyright 2008 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: --expose-debug-as debug 29 // Get the Debug object exposed from the debug context global object. 30 Debug = debug.Debug 31 32 // Simple object. 33 var a = {}; 34 35 // Create mirror for the object. 36 var mirror = debug.MakeMirror(a); 37 38 // Initially one reference from the global object. 39 assertEquals(1, mirror.referencedBy().length); 40 assertEquals(1, mirror.referencedBy(0).length); 41 assertEquals(1, mirror.referencedBy(1).length); 42 assertEquals(1, mirror.referencedBy(10).length); 43 44 // Add some more references from simple objects and arrays. 45 var b = {} 46 b.a = a; 47 assertEquals(2, mirror.referencedBy().length); 48 var c = {} 49 c.a = a; 50 c.aa = a; 51 c.aaa = a; 52 assertEquals(3, mirror.referencedBy().length); 53 function d(){}; 54 d.a = a 55 assertEquals(4, mirror.referencedBy().length); 56 e = [a,b,c,d]; 57 assertEquals(5, mirror.referencedBy().length); 58 59 60 // Simple closure. 61 function closure_simple(p) { 62 return function() { p = null; }; 63 } 64 65 // This adds a reference (function context). 66 f = closure_simple(a); 67 assertEquals(6, mirror.referencedBy().length); 68 // This clears the reference (in function context). 69 f() 70 assertEquals(5, mirror.referencedBy().length); 71 72 // Use closure with eval - creates arguments array. 73 function closure_eval(p, s) { 74 if (s) { 75 eval(s); 76 } 77 return function e(s) { eval(s); }; 78 } 79 80 // This adds a references (function context). 81 g = closure_eval(a); 82 assertEquals(6, mirror.referencedBy().length); 83 84 // Dynamically create a variable. This should create a context extension. 85 h = closure_eval(null, "var x_"); 86 assertEquals(6, mirror.referencedBy().length); 87 // Adds a reference when set. 88 h("x_ = a"); 89 var x = mirror.referencedBy(); 90 assertEquals(7, mirror.referencedBy().length); 91 // Removes a reference when cleared. 92 h("x_ = null"); 93 assertEquals(6, mirror.referencedBy().length); 94 95 // Check circular references. 96 x = {} 97 mirror = debug.MakeMirror(x); 98 assertEquals(1, mirror.referencedBy().length); 99 x.x = x; 100 assertEquals(2, mirror.referencedBy().length); 101 x = null; 102 assertEquals(0, mirror.referencedBy().length); 103 104 // Check many references. 105 y = {} 106 mirror = debug.MakeMirror(y); 107 refs = []; 108 for (var i = 0; i < 200; i++) { 109 refs[i] = {'y': y}; 110 } 111 y = null; 112 assertEquals(200, mirror.referencedBy().length); 113
