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| 1 // Copyright 2011 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: --allow-natives-syntax |
| 29 |
| 30 /** |
| 31 * This class shows how to use %GetOptimizationCount() and |
| 32 * %GetOptimizationStatus() to infer information about opts and deopts. |
| 33 * Might be nice to put this into mjsunit.js, but that doesn't depend on |
| 34 * the --allow-natives-syntax flag so far. |
| 35 */ |
| 36 function OptTracker() { |
| 37 this.opt_counts_ = {}; |
| 38 } |
| 39 |
| 40 /** |
| 41 * The possible optimization states of a function. Must be in sync with the |
| 42 * return values of Runtime_GetOptimizationStatus() in runtime.cc! |
| 43 * @enum {int} |
| 44 */ |
| 45 OptTracker.OptimizationState = { |
| 46 YES: 1, |
| 47 NO: 2, |
| 48 ALWAYS: 3, |
| 49 NEVER: 4 |
| 50 }; |
| 51 |
| 52 /** |
| 53 * Always call this at the beginning of your test, once for each function |
| 54 * that you later want to track de/optimizations for. It is necessary because |
| 55 * tests are sometimes executed several times in a row, and you want to |
| 56 * disregard counts from previous runs. |
| 57 */ |
| 58 OptTracker.prototype.CheckpointOptCount = function(func) { |
| 59 this.opt_counts_[func] = %GetOptimizationCount(func); |
| 60 }; |
| 61 |
| 62 OptTracker.prototype.AssertOptCount = function(func, optcount) { |
| 63 if (this.DisableAsserts_(func)) { |
| 64 return; |
| 65 } |
| 66 assertEquals(optcount, this.GetOptCount_(func)); |
| 67 }; |
| 68 |
| 69 OptTracker.prototype.AssertDeoptCount = function(func, deopt_count) { |
| 70 if (this.DisableAsserts_(func)) { |
| 71 return; |
| 72 } |
| 73 assertEquals(deopt_count, this.GetDeoptCount_(func)); |
| 74 }; |
| 75 |
| 76 OptTracker.prototype.AssertDeoptHappened = function(func, expect_deopt) { |
| 77 if (this.DisableAsserts_(func)) { |
| 78 return; |
| 79 } |
| 80 if (expect_deopt) { |
| 81 assertTrue(this.GetDeoptCount_(func) > 0); |
| 82 } else { |
| 83 assertEquals(0, this.GetDeoptCount_(func)); |
| 84 } |
| 85 } |
| 86 |
| 87 OptTracker.prototype.AssertIsOptimized = function(func, expect_optimized) { |
| 88 if (this.DisableAsserts_(func)) { |
| 89 return; |
| 90 } |
| 91 var raw_optimized = %GetOptimizationStatus(func); |
| 92 if (expect_optimized) { |
| 93 assertEquals(OptTracker.OptimizationState.YES, raw_optimized); |
| 94 } else { |
| 95 assertEquals(OptTracker.OptimizationState.NO, raw_optimized); |
| 96 } |
| 97 } |
| 98 |
| 99 /** |
| 100 * @private |
| 101 */ |
| 102 OptTracker.prototype.GetOptCount_ = function(func) { |
| 103 var raw_count = %GetOptimizationCount(func); |
| 104 if (func in this.opt_counts_) { |
| 105 var checkpointed_count = this.opt_counts_[func]; |
| 106 return raw_count - checkpointed_count; |
| 107 } |
| 108 return raw_count; |
| 109 } |
| 110 |
| 111 /** |
| 112 * @private |
| 113 */ |
| 114 OptTracker.prototype.GetDeoptCount_ = function(func) { |
| 115 var count = this.GetOptCount_(func); |
| 116 if (%GetOptimizationStatus(func) == OptTracker.OptimizationState.YES) { |
| 117 count -= 1; |
| 118 } |
| 119 return count; |
| 120 } |
| 121 |
| 122 /** |
| 123 * @private |
| 124 */ |
| 125 OptTracker.prototype.DisableAsserts_ = function(func) { |
| 126 switch(%GetOptimizationStatus(func)) { |
| 127 case OptTracker.OptimizationState.YES: |
| 128 case OptTracker.OptimizationState.NO: |
| 129 return false; |
| 130 case OptTracker.OptimizationState.ALWAYS: |
| 131 case OptTracker.OptimizationState.NEVER: |
| 132 return true; |
| 133 } |
| 134 return false; |
| 135 } |
| 136 // (End of class OptTracker.) |
| 137 |
| 138 // Example function used by the test below. |
| 139 function f(a) { |
| 140 return a+1; |
| 141 } |
| 142 |
| 143 var tracker = new OptTracker(); |
| 144 tracker.CheckpointOptCount(f); |
| 145 |
| 146 tracker.AssertOptCount(f, 0); |
| 147 tracker.AssertIsOptimized(f, false); |
| 148 tracker.AssertDeoptHappened(f, false); |
| 149 tracker.AssertDeoptCount(f, 0); |
| 150 |
| 151 for (var i = 0; i < 5; i++) f(1); |
| 152 |
| 153 tracker.AssertOptCount(f, 0); |
| 154 tracker.AssertIsOptimized(f, false); |
| 155 tracker.AssertDeoptHappened(f, false); |
| 156 tracker.AssertDeoptCount(f, 0); |
| 157 |
| 158 %OptimizeFunctionOnNextCall(f); |
| 159 f(1); |
| 160 |
| 161 tracker.AssertOptCount(f, 1); |
| 162 tracker.AssertIsOptimized(f, true); |
| 163 tracker.AssertDeoptHappened(f, false); |
| 164 tracker.AssertDeoptCount(f, 0); |
| 165 |
| 166 %DeoptimizeFunction(f); |
| 167 |
| 168 tracker.AssertOptCount(f, 1); |
| 169 tracker.AssertIsOptimized(f, false); |
| 170 tracker.AssertDeoptHappened(f, true); |
| 171 tracker.AssertDeoptCount(f, 1); |
| 172 |
| 173 // Let's trigger optimization for another type. |
| 174 for (var i = 0; i < 5; i++) f("a"); |
| 175 %OptimizeFunctionOnNextCall(f); |
| 176 f("b"); |
| 177 |
| 178 tracker.AssertOptCount(f, 2); |
| 179 tracker.AssertIsOptimized(f, true); |
| 180 tracker.AssertDeoptHappened(f, true); |
| 181 tracker.AssertDeoptCount(f, 1); |
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