Mercurial > hg > graal-compiler
diff src/share/vm/utilities/ticks.cpp @ 13400:86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
Reviewed-by: dholmes, egahlin
author | mgronlun |
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date | Sat, 23 Nov 2013 12:25:13 +0100 |
parents | |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/utilities/ticks.cpp Sat Nov 23 12:25:13 2013 +0100 @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "runtime/os.hpp" +#include "utilities/ticks.inline.hpp" + +#ifdef ASSERT + const jlong Ticks::invalid_time_stamp = -2; // 0xFFFF FFFF`FFFF FFFE +#endif + +void Ticks::stamp() { + _stamp_ticks = os::elapsed_counter(); +} + +const Ticks Ticks::now() { + Ticks t; + t.stamp(); + return t; +} + +Tickspan::Tickspan(const Ticks& end, const Ticks& start) { + assert(end.value() != Ticks::invalid_time_stamp, "end is unstamped!"); + assert(start.value() != Ticks::invalid_time_stamp, "start is unstamped!"); + + assert(end >= start, "negative time!"); + + _span_ticks = end.value() - start.value(); +} + +template <typename ReturnType> +static ReturnType time_conversion(const Tickspan& span, TicksToTimeHelper::Unit unit) { + assert(TicksToTimeHelper::SECONDS == unit || + TicksToTimeHelper::MILLISECONDS == unit, "invalid unit!"); + + ReturnType frequency_per_unit = (ReturnType)os::elapsed_frequency() / (ReturnType)unit; + + return (ReturnType) ((ReturnType)span.value() / frequency_per_unit); +} + +double TicksToTimeHelper::seconds(const Tickspan& span) { + return time_conversion<double>(span, SECONDS); +} + +jlong TicksToTimeHelper::milliseconds(const Tickspan& span) { + return time_conversion<jlong>(span, MILLISECONDS); +}