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Edit File: assert-opt-and-deopt.js
// Copyright 2011 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: --allow-natives-syntax /** * This class shows how to use %GetOptimizationCount() and * %GetOptimizationStatus() to infer information about opts and deopts. * Might be nice to put this into mjsunit.js, but that doesn't depend on * the --allow-natives-syntax flag so far. */ function OptTracker() { this.opt_counts_ = {}; } /** * The possible optimization states of a function. Must be in sync with the * return values of Runtime_GetOptimizationStatus() in runtime.cc! * @enum {int} */ OptTracker.OptimizationState = { YES: 1, NO: 2, ALWAYS: 3, NEVER: 4 }; /** * Always call this at the beginning of your test, once for each function * that you later want to track de/optimizations for. It is necessary because * tests are sometimes executed several times in a row, and you want to * disregard counts from previous runs. */ OptTracker.prototype.CheckpointOptCount = function(func) { this.opt_counts_[func] = %GetOptimizationCount(func); }; OptTracker.prototype.AssertOptCount = function(func, optcount) { if (this.DisableAsserts_(func)) { return; } assertEquals(optcount, this.GetOptCount_(func)); }; OptTracker.prototype.AssertDeoptCount = function(func, deopt_count) { if (this.DisableAsserts_(func)) { return; } assertEquals(deopt_count, this.GetDeoptCount_(func)); }; OptTracker.prototype.AssertDeoptHappened = function(func, expect_deopt) { if (this.DisableAsserts_(func)) { return; } if (expect_deopt) { assertTrue(this.GetDeoptCount_(func) > 0); } else { assertEquals(0, this.GetDeoptCount_(func)); } } OptTracker.prototype.AssertIsOptimized = function(func, expect_optimized) { if (this.DisableAsserts_(func)) { return; } var raw_optimized = %GetOptimizationStatus(func); if (expect_optimized) { assertEquals(OptTracker.OptimizationState.YES, raw_optimized); } else { assertEquals(OptTracker.OptimizationState.NO, raw_optimized); } } /** * @private */ OptTracker.prototype.GetOptCount_ = function(func) { var raw_count = %GetOptimizationCount(func); if (func in this.opt_counts_) { var checkpointed_count = this.opt_counts_[func]; return raw_count - checkpointed_count; } return raw_count; } /** * @private */ OptTracker.prototype.GetDeoptCount_ = function(func) { var count = this.GetOptCount_(func); if (%GetOptimizationStatus(func) == OptTracker.OptimizationState.YES) { count -= 1; } return count; } /** * @private */ OptTracker.prototype.DisableAsserts_ = function(func) { switch(%GetOptimizationStatus(func)) { case OptTracker.OptimizationState.YES: case OptTracker.OptimizationState.NO: return false; case OptTracker.OptimizationState.ALWAYS: case OptTracker.OptimizationState.NEVER: return true; } return false; } // (End of class OptTracker.) // Example function used by the test below. function f(a) { return a+1; } var tracker = new OptTracker(); tracker.CheckpointOptCount(f); tracker.AssertOptCount(f, 0); tracker.AssertIsOptimized(f, false); tracker.AssertDeoptHappened(f, false); tracker.AssertDeoptCount(f, 0); f(1); %OptimizeFunctionOnNextCall(f); f(1); tracker.AssertOptCount(f, 1); tracker.AssertIsOptimized(f, true); tracker.AssertDeoptHappened(f, false); tracker.AssertDeoptCount(f, 0); %DeoptimizeFunction(f); tracker.AssertOptCount(f, 1); tracker.AssertIsOptimized(f, false); tracker.AssertDeoptHappened(f, true); tracker.AssertDeoptCount(f, 1); // Let's trigger optimization for another type. for (var i = 0; i < 5; i++) f("a"); %OptimizeFunctionOnNextCall(f); f("b"); tracker.AssertOptCount(f, 2); tracker.AssertIsOptimized(f, true); tracker.AssertDeoptHappened(f, true); tracker.AssertDeoptCount(f, 1);