Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 5 | // Flags: --expose-debug-as debug --allow-natives-syntax --ignition-generators |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 6 | |
| 7 | var Debug = debug.Debug; |
| 8 | var LiveEdit = Debug.LiveEdit; |
| 9 | |
| 10 | unique_id = 0; |
| 11 | |
| 12 | var Generator = (function*(){}).constructor; |
| 13 | |
| 14 | function assertIteratorResult(value, done, result) { |
| 15 | assertEquals({value: value, done: done}, result); |
| 16 | } |
| 17 | |
| 18 | function MakeGenerator() { |
| 19 | // Prevents eval script caching. |
| 20 | unique_id++; |
| 21 | return Generator('callback', |
| 22 | "/* " + unique_id + "*/\n" + |
| 23 | "yield callback();\n" + |
| 24 | "return 'Cat';\n"); |
| 25 | } |
| 26 | |
| 27 | function MakeFunction() { |
| 28 | // Prevents eval script caching. |
| 29 | unique_id++; |
| 30 | return Function('callback', |
| 31 | "/* " + unique_id + "*/\n" + |
| 32 | "callback();\n" + |
| 33 | "return 'Cat';\n"); |
| 34 | } |
| 35 | |
| 36 | // First, try MakeGenerator with no perturbations. |
| 37 | (function(){ |
| 38 | var generator = MakeGenerator(); |
| 39 | function callback() {}; |
| 40 | var iter = generator(callback); |
| 41 | assertIteratorResult(undefined, false, iter.next()); |
| 42 | assertIteratorResult("Cat", true, iter.next()); |
| 43 | })(); |
| 44 | |
| 45 | function patch(fun, from, to) { |
| 46 | function debug() { |
| 47 | var log = new Array(); |
| 48 | var script = Debug.findScript(fun); |
| 49 | var pos = script.source.indexOf(from); |
| 50 | try { |
| 51 | LiveEdit.TestApi.ApplySingleChunkPatch(script, pos, from.length, to, |
| 52 | log); |
| 53 | } finally { |
| 54 | print("Change log: " + JSON.stringify(log) + "\n"); |
| 55 | } |
| 56 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 57 | %ExecuteInDebugContext(debug); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | // Try to edit a MakeGenerator while it's running, then again while it's |
| 61 | // stopped. |
| 62 | (function(){ |
| 63 | var generator = MakeGenerator(); |
| 64 | |
| 65 | var gen_patch_attempted = false; |
| 66 | function attempt_gen_patch() { |
| 67 | assertFalse(gen_patch_attempted); |
| 68 | gen_patch_attempted = true; |
| 69 | assertThrows(function() { patch(generator, "'Cat'", "'Capybara'") }, |
| 70 | LiveEdit.Failure); |
| 71 | }; |
| 72 | var iter = generator(attempt_gen_patch); |
| 73 | assertIteratorResult(undefined, false, iter.next()); |
| 74 | // Patch should not succeed because there is a live generator activation on |
| 75 | // the stack. |
| 76 | assertIteratorResult("Cat", true, iter.next()); |
| 77 | assertTrue(gen_patch_attempted); |
| 78 | |
| 79 | // At this point one iterator is live, but closed, so the patch will succeed. |
| 80 | patch(generator, "'Cat'", "'Capybara'"); |
| 81 | iter = generator(function(){}); |
| 82 | assertIteratorResult(undefined, false, iter.next()); |
| 83 | // Patch successful. |
| 84 | assertIteratorResult("Capybara", true, iter.next()); |
| 85 | |
| 86 | // Patching will fail however when a live iterator is suspended. |
| 87 | iter = generator(function(){}); |
| 88 | assertIteratorResult(undefined, false, iter.next()); |
| 89 | assertThrows(function() { patch(generator, "'Capybara'", "'Tapir'") }, |
| 90 | LiveEdit.Failure); |
| 91 | assertIteratorResult("Capybara", true, iter.next()); |
| 92 | |
| 93 | // Try to patch functions with activations inside and outside generator |
| 94 | // function activations. We should succeed in the former case, but not in the |
| 95 | // latter. |
| 96 | var fun_outside = MakeFunction(); |
| 97 | var fun_inside = MakeFunction(); |
| 98 | var fun_patch_attempted = false; |
| 99 | var fun_patch_restarted = false; |
| 100 | function attempt_fun_patches() { |
| 101 | if (fun_patch_attempted) { |
| 102 | assertFalse(fun_patch_restarted); |
| 103 | fun_patch_restarted = true; |
| 104 | return; |
| 105 | } |
| 106 | fun_patch_attempted = true; |
| 107 | // Patching outside a generator activation must fail. |
| 108 | assertThrows(function() { patch(fun_outside, "'Cat'", "'Cobra'") }, |
| 109 | LiveEdit.Failure); |
| 110 | // Patching inside a generator activation may succeed. |
| 111 | patch(fun_inside, "'Cat'", "'Koala'"); |
| 112 | } |
| 113 | iter = generator(function() { return fun_inside(attempt_fun_patches) }); |
| 114 | assertEquals('Cat', |
| 115 | fun_outside(function () { |
| 116 | assertIteratorResult('Koala', false, iter.next()); |
| 117 | assertTrue(fun_patch_restarted); |
| 118 | })); |
| 119 | })(); |