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: some function is being edited; the outer function has to have its 32// positions patched. Accoring to a special markup of function text 33// corresponding byte-code PCs should coincide before change and after it. 34 35Debug = debug.Debug 36 37eval( 38 "function F1() { return 5; }\n" + 39 "function ChooseAnimal(/*$*/ ) {\n" + 40 "/*$*/ var x = F1(/*$*/ );\n" + 41 "/*$*/ var res/*$*/ =/*$*/ (function() { return 'Cat'; } )();\n" + 42 "/*$*/ var y/*$*/ = F2(/*$*/ F1()/*$*/ , F1(/*$*/ )/*$*/ );\n" + 43 "/*$*/ if (/*$*/ x.toString(/*$*/ )) { /*$*/ y = 3;/*$*/ } else {/*$*/ y = 8;/*$*/ }\n" + 44 "/*$*/ var z = /*$*/ x * y;\n" + 45 "/*$*/ return/*$*/ res/*$*/ + z;/*$*/ }\n" + 46 "function F2(x, y) { return x + y; }" 47); 48 49// Find all *$* markers in text of the function and read corresponding statement 50// PCs. 51function ReadMarkerPositions(func) { 52 var text = func.toString(); 53 var positions = new Array(); 54 var match; 55 var pattern = /\/\*\$\*\//g; 56 while ((match = pattern.exec(text)) != null) { 57 positions.push(match.index); 58 } 59 return positions; 60} 61 62function ReadPCMap(func, positions) { 63 var res = new Array(); 64 for (var i = 0; i < positions.length; i++) { 65 var pc = Debug.LiveEdit.GetPcFromSourcePos(func, positions[i]); 66 67 if (typeof pc === 'undefined') { 68 // Function was marked for recompilation and it's code was replaced with a 69 // stub. This can happen at any time especially if we are running with 70 // --stress-opt. There is no way to get PCs now. 71 return; 72 } 73 74 res.push(pc); 75 } 76 77 return res; 78} 79 80function ApplyPatch(orig_animal, new_animal) { 81 var res = ChooseAnimal(); 82 assertEquals(orig_animal + "15", res); 83 84 var script = Debug.findScript(ChooseAnimal); 85 86 var orig_string = "'" + orig_animal + "'"; 87 var patch_string = "'" + new_animal + "'"; 88 var patch_pos = script.source.indexOf(orig_string); 89 90 var change_log = new Array(); 91 92 Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script, 93 patch_pos, 94 orig_string.length, 95 patch_string, 96 change_log); 97 98 print("Change log: " + JSON.stringify(change_log) + "\n"); 99 100 var markerPositions = ReadMarkerPositions(ChooseAnimal); 101 var pcArray = ReadPCMap(ChooseAnimal, markerPositions); 102 103 var res = ChooseAnimal(); 104 assertEquals(new_animal + "15", res); 105 106 return pcArray; 107} 108 109var pcArray1 = ApplyPatch('Cat', 'Dog'); 110 111// When we patched function for the first time it was deoptimized. 112// Check that after the second patch maping between sources position and 113// pcs will not change. 114 115var pcArray2 = ApplyPatch('Dog', 'Capybara'); 116 117print(pcArray1); 118print(pcArray2); 119 120// Function can be marked for recompilation at any point (especially if we are 121// running with --stress-opt). When we mark function for recompilation we 122// replace it's code with stub. So there is no reliable way to get PCs for 123// function. 124if (pcArray1 && pcArray2) { 125 assertArrayEquals(pcArray1, pcArray2); 126} 127