268 lines
7.0 KiB
C
268 lines
7.0 KiB
C
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// Copyright 2007-2008 Google Inc. All Rights Reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_COUNTERS_H_
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#define V8_COUNTERS_H_
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#include <wchar.h>
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namespace v8 { namespace internal {
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// StatsCounters is an interface for plugging into external
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// counters for monitoring. Counters can be looked up and
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// manipulated by name.
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class StatsTable : public AllStatic {
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public:
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// Register an application-defined function where
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// counters can be looked up.
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static void SetCounterFunction(CounterLookupCallback f) {
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lookup_function_ = f;
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}
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static bool HasCounterFunction() {
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return lookup_function_ != NULL;
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}
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// Lookup the location of a counter by name. If the lookup
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// is successful, returns a non-NULL pointer for writing the
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// value of the counter. Each thread calling this function
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// may receive a different location to store it's counter.
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// The return value must not be cached and re-used across
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// threads, although a single thread is free to cache it.
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static int *FindLocation(const wchar_t* name) {
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if (!lookup_function_) return NULL;
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return lookup_function_(name);
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}
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private:
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static CounterLookupCallback lookup_function_;
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};
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// StatsCounters are dynamically created values which can be tracked in
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// the StatsTable. They are designed to be lightweight to create and
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// easy to use.
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//
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// The implementation of the StatsTable is external to this module.
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//
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// Example usage:
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// {
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// StatsCounter request_count("RequestCount");
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// request_count.Increment();
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// }
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//
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// Internally, a counter represents a value in a row of a StatsTable.
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// The row has a 32bit value for each process/thread in the table and also
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// a name (stored in the table metadata). Since the storage location can be
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// thread-specific, this class cannot be shared across threads.
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//
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// StatsCounter represents a counter in the StatsTable class.
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class StatsCounter BASE_EMBEDDED {
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public:
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// Create a StatsCounter object.
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explicit StatsCounter(const wchar_t* name, int id) :
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lookup_done_(false),
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ptr_(NULL),
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id_(id) {
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int len = wcslen(name);
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// we prepend the name with 'c:' to indicate that it is a counter.
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name_ = NewArray<wchar_t>(len+3);
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wcscpy(name_, L"c:");
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wcscpy(&name_[2], name);
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};
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~StatsCounter() {
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DeleteArray(name_);
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}
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// Sets the counter to a specific value.
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void Set(int value) {
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int* loc = GetPtr();
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if (loc) *loc = value;
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}
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// Increments the counter.
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void Increment() {
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int* loc = GetPtr();
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if (loc) (*loc)++;
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}
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void Increment(int value) {
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int* loc = GetPtr();
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if (loc)
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(*loc) += value;
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}
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// Decrements the counter.
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void Decrement() {
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int* loc = GetPtr();
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if (loc) (*loc)--;
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}
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void Decrement(int value) {
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int* loc = GetPtr();
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if (loc) (*loc) -= value;
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}
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// Is this counter enabled?
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// Returns false if table is full.
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bool Enabled() {
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return GetPtr() != NULL;
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}
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// Get the internal pointer to the counter. This is used
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// by the code generator to emit code that manipulates a
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// given counter without calling the runtime system.
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int* GetInternalPointer() {
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int* loc = GetPtr();
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ASSERT(loc != NULL);
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return loc;
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}
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int Id() {
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return id_;
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}
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protected:
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StatsCounter() :
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lookup_done_(false),
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ptr_(NULL) {
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}
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// Returns the cached address of this counter location.
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int* GetPtr() {
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if (lookup_done_)
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return ptr_;
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lookup_done_ = true;
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ptr_ = StatsTable::FindLocation(name_);
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return ptr_;
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}
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wchar_t* name_;
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bool lookup_done_;
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int* ptr_;
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int id_;
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};
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// A StatsCounterTimer is a StatsCounter which keeps a timer during
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// the scope of the StatsCounterTimer. On destruction, it will record
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// its time measurement.
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class StatsCounterTimer : StatsCounter {
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public:
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// Constructs and starts the timer.
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explicit StatsCounterTimer(const wchar_t* name);
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// Start the timer.
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void Start();
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// Stop the timer and record the results.
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void Stop();
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// Returns true if the timer is running.
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bool Running() {
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return Enabled() && start_time_ != 0 && stop_time_ == 0;
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}
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private:
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// Compute the delta between start and stop, in milliseconds.
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void Record() {
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int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
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Increment(milliseconds);
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}
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int64_t start_time_;
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int64_t stop_time_;
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};
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// A StatsRate is a combination of both a timer and a counter so that
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// several statistics can be produced:
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// min, max, avg, count, total
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class StatsRate BASE_EMBEDDED {
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public:
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// Constructs and starts the timer.
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explicit StatsRate(const wchar_t* name, int id) :
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timer_(name),
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counter_(name, id) {
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}
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// Starts the rate timer.
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void Start() {
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timer_.Start();
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}
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// Stops the rate and records the time.
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void Stop() {
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if (timer_.Running()) {
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timer_.Stop();
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counter_.Increment();
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}
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}
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// Access to the timer.
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StatsCounterTimer& timer() { return timer_; }
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private:
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StatsCounterTimer timer_;
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StatsCounter counter_;
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};
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// Helper class for scoping a timer.
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class StatsTimerScope BASE_EMBEDDED {
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public:
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explicit StatsTimerScope(StatsCounterTimer* timer) :
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timer_(timer) {
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timer_->Start();
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}
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~StatsTimerScope() {
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timer_->Stop();
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}
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private:
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StatsCounterTimer* timer_;
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};
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// Helper class for scoping a rate.
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class StatsRateScope BASE_EMBEDDED {
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public:
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explicit StatsRateScope(StatsRate* rate) :
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rate_(rate) {
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rate_->Start();
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}
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~StatsRateScope() {
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rate_->Stop();
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}
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private:
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StatsRate* rate_;
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};
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} } // namespace v8::internal
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#endif // V8_COUNTERS_H_
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