1// Copyright 2010 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
31// Scenario: a function is being changed, which causes enclosing function to
32// have its positions patched; position changing requires new instance of Code
33// object to be introduced; the function happens to be on stack at this moment;
34// later it will resume over new instance of Code.
35// Before the change 2 rinfo are 22 characters away from each other. After the
36// change they are 114 characters away from each other. New instance of Code is
37// required when those numbers cross the border value of 64 (in any direction).
38
39Debug = debug.Debug
40
41eval(
42    "function BeingReplaced(changer, opt_x, opt_y) {\n" +
43    "  changer();\n" +
44    "  var res = new Object();\n" +
45    "  if (opt_x) { res.y = opt_y; }\n" +
46    "  res.a = (function() {})();\n" +
47    "  return res.a;\n" +
48    "}"
49);
50
51var script = Debug.findScript(BeingReplaced);
52
53var orig_body = "{}";
54var patch_pos = script.source.indexOf(orig_body);
55// Line long enough to change rinfo encoding.
56var new_body_patch = "{return 'Capybara';" +
57    "                                                                          " +
58    "}";
59
60var change_log = new Array();
61function Changer() {
62  Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script, patch_pos, orig_body.length, new_body_patch, change_log);
63  print("Change log: " + JSON.stringify(change_log) + "\n");
64}
65
66function NoOp() {
67}
68
69function CallM(changer) {
70  // We expect call IC here after several function runs.
71  return BeingReplaced(changer);
72}
73
74// This several iterations should cause call IC for BeingReplaced call. This IC
75// will keep reference to code object of BeingRepalced function. This reference
76// should also be patched. Unfortunately, this is a manually checked fact (from
77// debugger or debug print) and doesn't work as an automatic test.
78CallM(NoOp);
79CallM(NoOp);
80CallM(NoOp);
81
82var res = CallM(Changer);
83assertEquals("Capybara", res);
84