JezK
Edit File: debug-stepin-builtin-callback.js
// Copyright 2012 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 // Test stepping into callbacks passed to builtin functions. Debug = debug.Debug var exception = false; function array_listener(event, exec_state, event_data, data) { try { if (event == Debug.DebugEvent.Break) { if (breaks == 0) { exec_state.prepareStep(Debug.StepAction.StepIn, 2); breaks = 1; } else if (breaks <= 3) { breaks++; // Check whether we break at the expected line. print(event_data.sourceLineText()); assertTrue(event_data.sourceLineText().indexOf("Expected to step") > 0); exec_state.prepareStep(Debug.StepAction.StepIn, 3); } } } catch (e) { exception = true; } }; function cb_false(num) { print("element " + num); // Expected to step to this point. return false; } function cb_true(num) { print("element " + num); // Expected to step to this point. return true; } function cb_reduce(a, b) { print("elements " + a + " and " + b); // Expected to step to this point. return a + b; } var a = [1, 2, 3, 4]; Debug.setListener(array_listener); var breaks = 0; debugger; a.forEach(cb_true); assertFalse(exception); assertEquals(4, breaks); breaks = 0; debugger; a.some(cb_false); assertFalse(exception); assertEquals(4, breaks); breaks = 0; debugger; a.every(cb_true); assertEquals(4, breaks); assertFalse(exception); breaks = 0; debugger; a.map(cb_true); assertFalse(exception); assertEquals(4, breaks); breaks = 0; debugger; a.filter(cb_true); assertFalse(exception); assertEquals(4, breaks); breaks = 0; debugger; a.reduce(cb_reduce); assertFalse(exception); assertEquals(4, breaks); breaks = 0; debugger; a.reduceRight(cb_reduce); assertFalse(exception); assertEquals(4, breaks); Debug.setListener(null); // Test two levels of builtin callbacks: // Array.forEach calls a callback function, which by itself uses // Array.forEach with another callback function. function second_level_listener(event, exec_state, event_data, data) { try { if (event == Debug.DebugEvent.Break) { if (breaks == 0) { exec_state.prepareStep(Debug.StepAction.StepIn, 3); breaks = 1; } else if (breaks <= 16) { breaks++; // Check whether we break at the expected line. assertTrue(event_data.sourceLineText().indexOf("Expected to step") > 0); // Step two steps further every four breaks to skip the // forEach call in the first level of recurision. var step = (breaks % 4 == 1) ? 6 : 3; exec_state.prepareStep(Debug.StepAction.StepIn, step); } } } catch (e) { exception = true; } }; function cb_foreach(num) { a.forEach(cb_true); print("back to the first level of recursion."); } Debug.setListener(second_level_listener); breaks = 0; debugger; a.forEach(cb_foreach); assertFalse(exception); assertEquals(17, breaks); Debug.setListener(null);