JezK
Edit File: debug-step.js
// Copyright 2008 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. Debug = debug.Debug // Simple debug event handler which first time hit will perform 1000 steps and // second time hit will evaluate and store the value of "i". If requires that // the global property "state" is initially zero. var bp1, bp2; function listener(event, exec_state, event_data, data) { if (event == Debug.DebugEvent.Break) { if (state == 0) { exec_state.prepareStep(Debug.StepAction.StepIn, 1000); state = 1; } else if (state == 1) { result = exec_state.frame().evaluate("i").value(); // Clear the break point on line 2 if set. if (bp2) { Debug.clearBreakPoint(bp2); } } } }; // Add the debug event listener. Debug.setListener(listener); // Test debug event for break point. function f() { var i; // Line 1. for (i = 0; i < 1000; i++) { // Line 2. x = 1; // Line 3. } }; // Set a breakpoint on the for statement (line 1). bp1 = Debug.setBreakPoint(f, 1); // Check that performing 1000 steps will make i 499. state = 0; result = -1; f(); assertEquals(499, result); // Check that performing 1000 steps with a break point on the statement in the // for loop (line 2) will only make i 0 as a real break point breaks even when // multiple steps have been requested. state = 0; result = -1; bp2 = Debug.setBreakPoint(f, 3); f(); assertEquals(0, result); // Get rid of the debug event listener. Debug.setListener(null);