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