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Edit File: debug-liveedit-patch-positions-replace.js
// 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);