Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 296 insertions, 0 deletions

diff --git a/tools/profiler/public/ProfilerCounts.h b/tools/profiler/public/ProfilerCounts.h
new file mode 100644
index 0000000000..86f6cbfe4f
--- /dev/null
+++ b/tools/profiler/public/ProfilerCounts.h
@@ -0,0 +1,296 @@
+/* -*- 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