Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 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 | |
| 39 | Debug = debug.Debug |
| 40 | |
| 41 | eval( |
| 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 | |
| 51 | var script = Debug.findScript(BeingReplaced); |
| 52 | |
| 53 | var orig_body = "{}"; |
| 54 | var patch_pos = script.source.indexOf(orig_body); |
| 55 | // Line long enough to change rinfo encoding. |
| 56 | var new_body_patch = "{return 'Capybara';" + |
| 57 | " " + |
| 58 | "}"; |
| 59 | |
| 60 | var change_log = new Array(); |
| 61 | function 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 | |
| 66 | function NoOp() { |
| 67 | } |
| 68 | |
| 69 | function 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. |
| 78 | CallM(NoOp); |
| 79 | CallM(NoOp); |
| 80 | CallM(NoOp); |
| 81 | |
| 82 | var res = CallM(Changer); |
| 83 | assertEquals("Capybara", res); |