v8/test/mjsunit/assert-opt-and-deopt.js

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// 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);
tracker.AssertOptCount(f, 0);
tracker.AssertIsOptimized(f, false);
tracker.AssertDeoptHappened(f, false);
tracker.AssertDeoptCount(f, 0);
%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);