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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ProfilerCounts_h
+#define ProfilerCounts_h
+
+#ifndef MOZ_GECKO_PROFILER
+
+# define PROFILER_DEFINE_COUNT_TOTAL(label, category, description)
+# define PROFILER_DEFINE_COUNT(label, category, description)
+# define PROFILER_DEFINE_STATIC_COUNT_TOTAL(label, category, description)
+# define AUTO_PROFILER_TOTAL(label, count)
+# define AUTO_PROFILER_COUNT(label)
+# define AUTO_PROFILER_STATIC_COUNT(label, count)
+
+#else
+
+# include "mozilla/Atomics.h"
+
+class BaseProfilerCount;
+void profiler_add_sampled_counter(BaseProfilerCount* aCounter);
+void profiler_remove_sampled_counter(BaseProfilerCount* aCounter);
+
+typedef mozilla::Atomic<int64_t, mozilla::MemoryOrdering::Relaxed>
+ ProfilerAtomicSigned;
+typedef mozilla::Atomic<uint64_t, mozilla::MemoryOrdering::Relaxed>
+ ProfilerAtomicUnsigned;
+
+// Counter support
+// There are two types of counters:
+// 1) a simple counter which can be added to or subtracted from. This could
+// track the number of objects of a type, the number of calls to something
+// (reflow, JIT, etc).
+// 2) a combined counter which has the above, plus a number-of-calls counter
+// that is incremented by 1 for each call to modify the count. This provides
+// an optional source for a 'heatmap' of access. This can be used (for
+// example) to track the amount of memory allocated, and provide a heatmap of
+// memory operations (allocs/frees).
+//
+// Counters are sampled by the profiler once per sample-period. At this time,
+// all counters are global to the process. In the future, there might be more
+// versions with per-thread or other discriminators.
+//
+// Typical usage:
+// There are two ways to use counters: With heap-created counter objects,
+// or using macros. Note: the macros use statics, and will be slightly
+// faster/smaller, and you need to care about creating them before using
+// them. They're similar to the use-pattern for the other AUTO_PROFILER*
+// macros, but they do need the PROFILER_DEFINE* to be use to instantiate
+// the statics.
+//
+// PROFILER_DEFINE_COUNT(mything, "JIT", "Some JIT byte count")
+// ...
+// void foo() { ... AUTO_PROFILER_COUNT(mything, number_of_bytes_used); ... }
+//
+// or (to also get a heatmap)
+//
+// PROFILER_DEFINE_COUNT_TOTAL(mything, "JIT", "Some JIT byte count")
+// ...
+// void foo() {
+// ...
+// AUTO_PROFILER_COUNT_TOTAL(mything, number_of_bytes_generated);
+// ...
+// }
+//
+// To use without statics/macros:
+//
+// UniquePtr<ProfilerCounter> myCounter;
+// ...
+// myCounter =
+// MakeUnique<ProfilerCounter>("mything", "JIT", "Some JIT byte count"));
+// ...
+// void foo() { ... myCounter->Add(number_of_bytes_generated0; ... }
+
+class BaseProfilerCount {
+ public:
+ BaseProfilerCount(const char* aLabel, ProfilerAtomicSigned* aCounter,
+ ProfilerAtomicUnsigned* aNumber, const char* aCategory,
+ const char* aDescription)
+ : mLabel(aLabel),
+ mCategory(aCategory),
+ mDescription(aDescription),
+ mCounter(aCounter),
+ mNumber(aNumber) {
+# define COUNTER_CANARY 0xDEADBEEF
+# ifdef DEBUG
+ mCanary = COUNTER_CANARY;
+ mPrevNumber = 0;
+# endif
+ // Can't call profiler_* here since this may be non-xul-library
+ }
+
+ virtual ~BaseProfilerCount() {
+# ifdef DEBUG
+ mCanary = 0;
+# endif
+ }
+
+ struct CountSample {
+ int64_t count;
+ uint64_t number;
+ // This field indicates if the sample has already been consummed by a call
+ // to the Sample() method. This allows the profiler to discard duplicate
+ // samples if the counter sampling rate is lower than the profiler sampling
+ // rate. This can happen for example with some power meters that sample up
+ // to every 10ms.
+ // It should always be true when calling Sample() for the first time.
+ bool isSampleNew;
+ };
+ virtual CountSample Sample() {
+ MOZ_ASSERT(mCanary == COUNTER_CANARY);
+
+ CountSample result;
+ result.count = *mCounter;
+ result.number = mNumber ? *mNumber : 0;
+# ifdef DEBUG
+ MOZ_ASSERT(result.number >= mPrevNumber);
+ mPrevNumber = result.number;
+# endif
+ result.isSampleNew = true;
+ return result;
+ }
+
+ void Clear() {
+ *mCounter = 0;
+ // We don't reset *mNumber or mPrevNumber. We encode numbers as
+ // positive deltas, and currently we only care about the deltas (for
+ // e.g. heatmaps). If we ever need to clear mNumber as well, we can an
+ // alternative method (Reset()) to do so.
+ }
+
+ // We don't define ++ and Add() here, since the static defines directly
+ // increment the atomic counters, and the subclasses implement ++ and
+ // Add() directly.
+
+ // These typically are static strings (for example if you use the macros
+ // below)
+ const char* mLabel;
+ const char* mCategory;
+ const char* mDescription;
+ // We're ok with these being un-ordered in race conditions. These are
+ // pointers because we want to be able to use statics and increment them
+ // directly. Otherwise we could just have them inline, and not need the
+ // constructor args.
+ // These can be static globals (using the macros below), though they
+ // don't have to be - their lifetime must be longer than the use of them
+ // by the profiler (see profiler_add/remove_sampled_counter()). If you're
+ // using a lot of these, they probably should be allocated at runtime (see
+ // class ProfilerCountOnly below).
+ ProfilerAtomicSigned* mCounter;
+ ProfilerAtomicUnsigned* mNumber; // may be null
+
+# ifdef DEBUG
+ uint32_t mCanary;
+ uint64_t mPrevNumber; // value of number from the last Sample()
+# endif
+};
+
+// Designed to be allocated dynamically, and simply incremented with obj++
+// or obj->Add(n)
+class ProfilerCounter final : public BaseProfilerCount {
+ public:
+ ProfilerCounter(const char* aLabel, const char* aCategory,
+ const char* aDescription)
+ : BaseProfilerCount(aLabel, &mCounter, nullptr, aCategory, aDescription) {
+ // Assume we're in libxul
+ profiler_add_sampled_counter(this);
+ }
+
+ virtual ~ProfilerCounter() { profiler_remove_sampled_counter(this); }
+
+ BaseProfilerCount& operator++() {
+ Add(1);
+ return *this;
+ }
+
+ void Add(int64_t aNumber) { mCounter += aNumber; }
+
+ ProfilerAtomicSigned mCounter;
+};
+
+// Also keeps a heatmap (number of calls to ++/Add())
+class ProfilerCounterTotal final : public BaseProfilerCount {
+ public:
+ ProfilerCounterTotal(const char* aLabel, const char* aCategory,
+ const char* aDescription)
+ : BaseProfilerCount(aLabel, &mCounter, &mNumber, aCategory,
+ aDescription) {
+ // Assume we're in libxul
+ profiler_add_sampled_counter(this);
+ }
+
+ virtual ~ProfilerCounterTotal() { profiler_remove_sampled_counter(this); }
+
+ BaseProfilerCount& operator++() {
+ Add(1);
+ return *this;
+ }
+
+ void Add(int64_t aNumber) {
+ mCounter += aNumber;
+ mNumber++;
+ }
+
+ ProfilerAtomicSigned mCounter;
+ ProfilerAtomicUnsigned mNumber;
+};
+
+// Defines a counter that is sampled on each profiler tick, with a running
+// count (signed), and number-of-instances. Note that because these are two
+// independent Atomics, there is a possiblity that count will not include
+// the last call, but number of uses will. I think this is not worth
+// worrying about
+# define PROFILER_DEFINE_COUNT_TOTAL(label, category, description) \
+ ProfilerAtomicSigned profiler_count_##label(0); \
+ ProfilerAtomicUnsigned profiler_number_##label(0); \
+ const char profiler_category_##label[] = category; \
+ const char profiler_description_##label[] = description; \
+ mozilla::UniquePtr<BaseProfilerCount> AutoCount_##label;
+
+// This counts, but doesn't keep track of the number of calls to
+// AUTO_PROFILER_COUNT()
+# define PROFILER_DEFINE_COUNT(label, category, description) \
+ ProfilerAtomicSigned profiler_count_##label(0); \
+ const char profiler_category_##label[] = category; \
+ const char profiler_description_##label[] = description; \
+ mozilla::UniquePtr<BaseProfilerCount> AutoCount_##label;
+
+// This will create a static initializer if used, but avoids a possible
+// allocation.
+# define PROFILER_DEFINE_STATIC_COUNT_TOTAL(label, category, description) \
+ ProfilerAtomicSigned profiler_count_##label(0); \
+ ProfilerAtomicUnsigned profiler_number_##label(0); \
+ BaseProfilerCount AutoCount_##label(#label, &profiler_count_##label, \
+ &profiler_number_##label, category, \
+ description);
+
+// If we didn't care about static initializers, we could avoid the need for
+// a ptr to the BaseProfilerCount object.
+
+// XXX It would be better to do this without the if() and without the
+// theoretical race to set the UniquePtr (i.e. possible leak).
+# define AUTO_PROFILER_COUNT_TOTAL(label, count) \
+ do { \
+ profiler_number_##label++; /* do this first*/ \
+ profiler_count_##label += count; \
+ if (!AutoCount_##label) { \
+ /* Ignore that we could call this twice in theory, and that we leak \
+ * them \
+ */ \
+ AutoCount_##label.reset(new BaseProfilerCount( \
+ #label, &profiler_count_##label, &profiler_number_##label, \
+ profiler_category_##label, profiler_description_##label)); \
+ profiler_add_sampled_counter(AutoCount_##label.get()); \
+ } \
+ } while (0)
+
+# define AUTO_PROFILER_COUNT(label, count) \
+ do { \
+ profiler_count_##label += count; /* do this first*/ \
+ if (!AutoCount_##label) { \
+ /* Ignore that we could call this twice in theory, and that we leak \
+ * them \
+ */ \
+ AutoCount_##label.reset(new BaseProfilerCount( \
+ #label, nullptr, &profiler_number_##label, \
+ profiler_category_##label, profiler_description_##label)); \
+ profiler_add_sampled_counter(AutoCount_##label.get()); \
+ } \
+ } while (0)
+
+# define AUTO_PROFILER_STATIC_COUNT(label, count) \
+ do { \
+ profiler_number_##label++; /* do this first*/ \
+ profiler_count_##label += count; \
+ } while (0)
+
+// if we need to force the allocation
+# define AUTO_PROFILER_FORCE_ALLOCATION(label) \
+ do { \
+ if (!AutoCount_##label) { \
+ /* Ignore that we could call this twice in theory, and that we leak \
+ * them \
+ */ \
+ AutoCount_##label.reset(new BaseProfilerCount( \
+ #label, &profiler_count_##label, &profiler_number_##label, \
+ profiler_category_##label, profiler_description_##label)); \
+ } \
+ } while (0)
+
+#endif // !MOZ_GECKO_PROFILER
+
+#endif // ProfilerCounts_h