v8/test/mjsunit/call-counts.js

47 lines
1.2 KiB
JavaScript

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax --noalways-opt --no-vector-stores
// We disable vector store ICs because slot indices change when this option
// is enabled.
// Locations in the type feedback vector where call counts are maintained for
// the two calls made from bar();
(function() {
const kFooCallExtraIndex = 5;
const kArrayCallExtraIndex = 7;
function GetCallCount(func, slot) {
var vector = %GetTypeFeedbackVector(func);
// Call counts are recorded doubled.
var value = %FixedArrayGet(vector, slot);
return Math.floor(value / 2);
}
function foo(a) { return a[3] * 16; }
function bar(a) {
var result = 0;
for (var i = 0; i < 10; i++) {
result = foo(a);
if (i % 2 === 0) {
var r = Array();
r[0] = 1;
result += r[0];
}
}
return result;
}
var a = [1, 2, 3];
bar(a);
assertEquals(10, GetCallCount(bar, kFooCallExtraIndex));
assertEquals(5, GetCallCount(bar, kArrayCallExtraIndex));
%OptimizeFunctionOnNextCall(bar);
bar(a);
})();