1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.
// Scenario: a function is being changed, which causes enclosing function to
// have its positions patched; position changing requires new instance of Code
// object to be introduced; the function happens to be on stack at this moment;
// later it will resume over new instance of Code.
// Before the change 2 rinfo are 22 characters away from each other. After the
// change they are 114 characters away from each other. New instance of Code is
// required when those numbers cross the border value of 64 (in any direction).
Debug = debug.Debug
eval(
"function BeingReplaced(changer, opt_x, opt_y) {\n" +
" changer();\n" +
" var res = new Object();\n" +
" if (opt_x) { res.y = opt_y; }\n" +
" res.a = (function() {})();\n" +
" return res.a;\n" +
"}"
);
var script = Debug.findScript(BeingReplaced);
var orig_body = "{}";
var patch_pos = script.source.indexOf(orig_body);
// Line long enough to change rinfo encoding.
var new_body_patch = "{return 'Capybara';" +
" " +
"}";
var change_log = new Array();
function Changer() {
Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script, patch_pos, orig_body.length, new_body_patch, change_log);
print("Change log: " + JSON.stringify(change_log) + "\n");
}
function NoOp() {
}
function CallM(changer) {
// We expect call IC here after several function runs.
return BeingReplaced(changer);
}
// This several iterations should cause call IC for BeingReplaced call. This IC
// will keep reference to code object of BeingRepalced function. This reference
// should also be patched. Unfortunately, this is a manually checked fact (from
// debugger or debug print) and doesn't work as an automatic test.
CallM(NoOp);
CallM(NoOp);
CallM(NoOp);
var res = CallM(Changer);
assertEquals("Capybara", res);
|
