Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/src/counters.h b/src/counters.h
new file mode 100644
index 0000000..5f4dca9
--- /dev/null
+++ b/src/counters.h
@@ -0,0 +1,239 @@
+// Copyright 2007-2008 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.
+
+#ifndef V8_COUNTERS_H_
+#define V8_COUNTERS_H_
+
+namespace v8 {
+namespace internal {
+
+// StatsCounters is an interface for plugging into external
+// counters for monitoring. Counters can be looked up and
+// manipulated by name.
+
+class StatsTable : public AllStatic {
+ public:
+ // Register an application-defined function where
+ // counters can be looked up.
+ static void SetCounterFunction(CounterLookupCallback f) {
+ lookup_function_ = f;
+ }
+
+ // Register an application-defined function to create
+ // a histogram for passing to the AddHistogramSample function
+ static void SetCreateHistogramFunction(CreateHistogramCallback f) {
+ create_histogram_function_ = f;
+ }
+
+ // Register an application-defined function to add a sample
+ // to a histogram created with CreateHistogram function
+ static void SetAddHistogramSampleFunction(AddHistogramSampleCallback f) {
+ add_histogram_sample_function_ = f;
+ }
+
+ static bool HasCounterFunction() {
+ return lookup_function_ != NULL;
+ }
+
+ // Lookup the location of a counter by name. If the lookup
+ // is successful, returns a non-NULL pointer for writing the
+ // value of the counter. Each thread calling this function
+ // may receive a different location to store it's counter.
+ // The return value must not be cached and re-used across
+ // threads, although a single thread is free to cache it.
+ static int *FindLocation(const char* name) {
+ if (!lookup_function_) return NULL;
+ return lookup_function_(name);
+ }
+
+ // Create a histogram by name. If the create is successful,
+ // returns a non-NULL pointer for use with AddHistogramSample
+ // function. min and max define the expected minimum and maximum
+ // sample values. buckets is the maximum number of buckets
+ // that the samples will be grouped into.
+ static void* CreateHistogram(const char* name,
+ int min,
+ int max,
+ size_t buckets) {
+ if (!create_histogram_function_) return NULL;
+ return create_histogram_function_(name, min, max, buckets);
+ }
+
+ // Add a sample to a histogram created with the CreateHistogram
+ // function.
+ static void AddHistogramSample(void* histogram, int sample) {
+ if (!add_histogram_sample_function_) return;
+ return add_histogram_sample_function_(histogram, sample);
+ }
+
+ private:
+ static CounterLookupCallback lookup_function_;
+ static CreateHistogramCallback create_histogram_function_;
+ static AddHistogramSampleCallback add_histogram_sample_function_;
+};
+
+// StatsCounters are dynamically created values which can be tracked in
+// the StatsTable. They are designed to be lightweight to create and
+// easy to use.
+//
+// Internally, a counter represents a value in a row of a StatsTable.
+// The row has a 32bit value for each process/thread in the table and also
+// a name (stored in the table metadata). Since the storage location can be
+// thread-specific, this class cannot be shared across threads.
+//
+// This class is designed to be POD initialized. It will be registered with
+// the counter system on first use. For example:
+// StatsCounter c = { "c:myctr", NULL, false };
+struct StatsCounter {
+ const char* name_;
+ int* ptr_;
+ bool lookup_done_;
+
+ // Sets the counter to a specific value.
+ void Set(int value) {
+ int* loc = GetPtr();
+ if (loc) *loc = value;
+ }
+
+ // Increments the counter.
+ void Increment() {
+ int* loc = GetPtr();
+ if (loc) (*loc)++;
+ }
+
+ void Increment(int value) {
+ int* loc = GetPtr();
+ if (loc)
+ (*loc) += value;
+ }
+
+ // Decrements the counter.
+ void Decrement() {
+ int* loc = GetPtr();
+ if (loc) (*loc)--;
+ }
+
+ void Decrement(int value) {
+ int* loc = GetPtr();
+ if (loc) (*loc) -= value;
+ }
+
+ // Is this counter enabled?
+ // Returns false if table is full.
+ bool Enabled() {
+ return GetPtr() != NULL;
+ }
+
+ // Get the internal pointer to the counter. This is used
+ // by the code generator to emit code that manipulates a
+ // given counter without calling the runtime system.
+ int* GetInternalPointer() {
+ int* loc = GetPtr();
+ ASSERT(loc != NULL);
+ return loc;
+ }
+
+ protected:
+ // Returns the cached address of this counter location.
+ int* GetPtr() {
+ if (lookup_done_)
+ return ptr_;
+ lookup_done_ = true;
+ ptr_ = StatsTable::FindLocation(name_);
+ return ptr_;
+ }
+};
+
+// StatsCounterTimer t = { { L"t:foo", NULL, false }, 0, 0 };
+struct StatsCounterTimer {
+ StatsCounter counter_;
+
+ int64_t start_time_;
+ int64_t stop_time_;
+
+ // Start the timer.
+ void Start();
+
+ // Stop the timer and record the results.
+ void Stop();
+
+ // Returns true if the timer is running.
+ bool Running() {
+ return counter_.Enabled() && start_time_ != 0 && stop_time_ == 0;
+ }
+};
+
+// A HistogramTimer allows distributions of results to be created
+// HistogramTimer t = { L"foo", NULL, false, 0, 0 };
+struct HistogramTimer {
+ const char* name_;
+ void* histogram_;
+ bool lookup_done_;
+
+ int64_t start_time_;
+ int64_t stop_time_;
+
+ // Start the timer.
+ void Start();
+
+ // Stop the timer and record the results.
+ void Stop();
+
+ // Returns true if the timer is running.
+ bool Running() {
+ return (histogram_ != NULL) && (start_time_ != 0) && (stop_time_ == 0);
+ }
+
+ protected:
+ // Returns the handle to the histogram.
+ void* GetHistogram() {
+ if (!lookup_done_) {
+ lookup_done_ = true;
+ histogram_ = StatsTable::CreateHistogram(name_, 0, 10000, 50);
+ }
+ return histogram_;
+ }
+};
+
+// Helper class for scoping a HistogramTimer.
+class HistogramTimerScope BASE_EMBEDDED {
+ public:
+ explicit HistogramTimerScope(HistogramTimer* timer) :
+ timer_(timer) {
+ timer_->Start();
+ }
+ ~HistogramTimerScope() {
+ timer_->Stop();
+ }
+ private:
+ HistogramTimer* timer_;
+};
+
+
+} } // namespace v8::internal
+
+#endif // V8_COUNTERS_H_